I was talking with a friend, and said someone was "crazy as a Betsy Bug." He had never heard that, and went on to say sometimes he's amused by the way I say things. I have quite a few of these- my favorite being "nuttier than a squirrel turd." I used to work with a lady who would always say, "I'll tell them just how the cow ate the cabbage." There are too many to list "More than Carter has liver pills." "Drunker than Cooter Brown." (I'm not sure who Cooter Brown was, but apparently he drank a lot.) "Dumber than a box of rocks." "Like white on rice" (to describe things that are very close to each other) "Happier than a pig in poop." "Slicker than deer snot."
What are your favorites?