I was glancing through the latest Dilbert Newsletter and found these great quotes from actual in-DUH-viduals. I might have to put a few of these gems into my repetoire :)

"That really burns my goat!"
"He had the eyes of a bat."
"I don't feel like the sharpest button on the beach today."
"I just got my car fixed and it's runnin' like a dime."
"I won't cow-tail to anyone."
"She exaggerates EVERYTHING."
"The Albatross of Damocles is hanging over your neck."
"There's more than one way to lick a cat."
"They've dumped you in the briar patch and told you to sink or swim."
"We've got a cash cow that's turning into a dog that needs milking."