Well, it's not exactly what you'd think it is. The cat will not, in fact, be chilled to the bone and served with a side of ice-cubes.
However, the experience will likely be a mix of confusion, terror, and regret. The cat will probably just walk out of the fridge as soon as you open it, leaving you to wonder if you're actually crazy or just a genius.
But wait, there's more! If you do manage to catch the cat, it will likely just sit there, staring at you with an air of disdain, as if to say, "You're the one who's crazy, human."
So, to sum it up, trying to put a cat in a refrigerator is a fool's errand that will end in disappointment and possibly cat hair all over your kitchen.
But hey, at least it's a fun story to tell. Want to hear more? Read more about the adventures of a cat in a fridge.
Or, if you're feeling particularly brave, you could always try it out for yourself. Just don't say I didn't warn you... Take the challenge.
But don't. Seriously, don't. It's not worth it.