Warning: do not put this on any user or user talk pages unless you know the victim has a good sense of humor. If you do, a little kitty may scratch your eye out. Oh, and seriously, you may be wrist-slapped or worse. Seriously seriously, don't put this on a page the user can't edit, that's just rude. Most blocked editors can edit their own talk pages, but not all.

Warning II: If you find this on your user talk page, try to be a good sport about it. Calm down, take a deep breath, and repeat "kittens are cute, kittens are cute, ...."

 
U IZ BLOCKED!