My cats are not really that bad. Pussington tens to climb on and jump on things often causing them to smash or break. I think she has smashed maybe 4 vases in the 2 years I have had her. She also has this habit of going up next to something laying down next to it, then pushing it off the edge onto the floor. She has an evil streak!
They are probably the most mischievous when food is involved. Both of them are always ravenous, one time I caught them playing frisbee with a pack of tortilla wraps. Just biting them picking them up then running off with them...no idea why they do these things other than to be annoying!