What a funny topic! Maxx is guilty of the litter-box thing. Other annoying habits are that she somehow manages to find my husband's golf balls and plays with them on the tile floor, which is extremely loud at 3 am! She drinks out of my water glass, sits right on my breastbone while I'm trying to sleep (ouch) and attacks the fish in the fish tank (through the glass). At exactly 11 p.m. every night, she goes completely nuts and runs around the house like an idiot, growling and grunting. That's not really annoying but pretty funny. We call it "kitty happy hour" around here. My cat doesn't need catnip! She also drinks out of the toilets, despite the fact that she gets fresh water twice a day. When I'm having a bath, she sits on the edge of the tub, sticking her paws in and drinking the water. Despite all these goofy antics, I love her to death! But the most annoying of all...when I pick up her food dish in the morning to feed her, she batts the dish, usually causing me to spill kibble all over the kitchen floor, which is not fun to clean up when you're still half asleep!