15 Weird Things Cats Do (And Why They Do Them)

Cats are gloriously weird creatures. Just when you think you’ve figured them out, they do something completely baffling. Here are 15 bizarre cat behaviours that leave owners scratching their heads—and the surprisingly logical reasons behind them.

1. The 3am Zoomies

Your cat has been sleeping all day. Then, at 3am, they suddenly decide it’s time to sprint through the house like they’re being chased by invisible demons.

Why they do it: Cats are crepuscular (most active at dawn and dusk). Those midnight zoomies are their natural hunting instincts kicking in. Indoor cats especially need to burn off pent-up energy—and they don’t care about your sleep schedule.

2. Knocking Things Off Tables

Your cat locks eyes with you, extends a paw, and slowly… deliberately… pushes your water glass off the table. Is this spite?

Why they do it: It’s actually about testing their environment and getting your attention. Cats use their paws to investigate objects (their paw pads are highly sensitive), and they quickly learn that pushing things creates an entertaining reaction—both from the object and from you.

3. Chattering at Birds

That weird teeth-chattering, chirping sound your cat makes while watching birds through the window? It sounds like they’re trying to communicate in bird language.

Why they do it: Experts aren’t entirely sure, but theories include: frustration at being unable to catch prey, a reflex mimicking the killing bite, or possibly an attempt to lure prey by imitating bird sounds. Whatever the reason, it’s adorably intense.

4. Sitting in Boxes (Even Tiny Ones)

You bought an expensive cat bed, but your cat is sitting in the shoebox it came in. Or trying to squeeze into a box clearly designed for a much smaller cat.

Why they do it: Enclosed spaces make cats feel safe and secure—it’s a survival instinct. Boxes provide excellent hiding spots where they can observe without being seen. Plus, cardboard is a great insulator, keeping them cosy. Size is apparently irrelevant.

5. Bringing You “Gifts”

Nothing says “good morning” like a dead mouse on your pillow. Or a live one. Or half of one.

Why they do it: Your cat thinks you’re a rubbish hunter. Mother cats bring prey to their kittens to teach hunting skills. Your cat may be trying to teach you, share their bounty, or simply show off their prowess. It’s genuinely meant as a gift—try to look grateful.

6. The “If I Fits, I Sits” Phenomenon

Sinks, plant pots, laundry baskets, your laptop keyboard, that one specific spot on the stairs—if there’s a small space, your cat will attempt to occupy it.

Why they do it: Tight spaces feel secure, warm, and defensive. Cats can’t be ambushed from behind in a sink or bowl. It’s the same box-sitting instinct applied to any vaguely enclosed area. Your laptop keyboard also happens to be warm and smells like you.

7. Kneading (Making Biscuits)

Your cat rhythmically pushes their paws against soft surfaces—blankets, cushions, your stomach—like they’re kneading dough.

Why they do it: This behaviour begins in kittenhood. Kittens knead their mother’s belly to stimulate milk flow. Adult cats continue the motion when feeling content and secure—it’s basically a sign they’re happy and associating you with the comfort of their mum.

8. Ignoring the Expensive Toy for the Box

You spent £30 on an interactive toy. Your cat is now playing with the receipt.

Why they do it: Cats are drawn to novelty and movement. A crinkly receipt moves unpredictably and makes interesting sounds. That fancy toy? It’s just sitting there. Being boring. Cats also can’t resist paper because it retains scents and makes satisfying noises when attacked.

9. Staring at Nothing

Your cat is intensely focused on an empty corner of the room. There’s definitely a ghost, right?

Why they do it: Cats hear frequencies up to 64kHz (humans max out around 20kHz) and see UV light. They might be tracking sounds or movements completely imperceptible to you—a bug, dust particle, or sound in the walls. Probably not ghosts. Probably.

10. Burying Food

Your cat takes a few bites of dinner, then spends five minutes trying to “bury” it by scratching the floor around their bowl.

Why they do it: This is called “caching” behaviour. Wild cats bury leftover food to hide it from scavengers and return to it later. Your cat is following the same instinct, even though they know there’s a whole bag of biscuits in the cupboard.

11. The Belly Trap

Your cat rolls over, showing their fluffy tummy. You reach to pet it. ATTACK! Teeth and claws everywhere.

Why they do it: A cat showing their belly is demonstrating trust—it’s a vulnerable position. But it’s not necessarily an invitation to touch. The belly grab-and-kick is also a defensive move and play-fighting behaviour. Your cat isn’t being mean; you just misread the signal.

12. Drinking From the Tap

You’ve provided fresh water in a lovely bowl. Your cat insists on drinking from the dripping bathroom tap instead.

Why they do it: Running water seems fresher to cats—in the wild, still water is more likely to harbour bacteria. Many cats also prefer water away from their food (which makes sense—you wouldn’t want your drink next to a dead mouse). The movement of running water is also more interesting to them.

13. Head-Butting You

Your cat approaches and firmly bumps their head against your face, hand, or leg.

Why they do it: This is called “bunting” and it’s a huge compliment. Cats have scent glands on their heads, and bunting marks you as part of their colony. It’s essentially your cat saying “you’re mine” and “I feel safe with you.” Head-butt them back (gently) to return the sentiment.

14. Sitting on Whatever You’re Reading

Newspaper? Laptop? Important documents? Your cat will plant themselves directly on top of it.

Why they do it: Your cat wants attention and has noticed that this particular object is getting yours. They’re not jealous of the laptop (probably)—they just know that putting themselves between you and whatever you’re focused on works. Also, laptops are warm.

15. Running Away After Using the Litter Box

Your cat finishes their business, then tears through the house like something’s chasing them. What just happened in there?

Why they do it: Several theories exist: they feel vulnerable while eliminating and are fleeing to safety; stimulation of the vagus nerve during elimination gives them a burst of energy; or they’re simply celebrating feeling lighter. Whatever the reason, post-poo zoomies are completely normal.

Embrace the Weird

These bizarre behaviours are part of what makes cats such fascinating companions. While some quirks have clear evolutionary explanations, others remain delightfully mysterious. Your cat’s weirdness isn’t a bug—it’s a feature.

Want to understand more about your cat’s behaviour? Learn why cats stare or discover the truth behind common cat myths.

More cat content: Learn why cats stare and discover the truth behind common cat myths.