They Say Cats Are Liquid
Everyone knows cats are basically liquid. No space is too small, too improbable, or out of reach for a determined feline. They’ll always find a way to fit in. Cats can twist themselves into all kinds of strange forms because their shoulders are attached to muscles rather than bones.

Source: Reddit
And if you’ve never believed the “cats are liquid” statements and need proof, then this should clear all doubts. The fact that there’s actually no liquid in this bucket and it’s a cat should be sufficient evidence. Seriously, who else thought this was liquid at first?