This site is too hilarious: Dumb things said in, and by, restaurants. A couple of my favorites:
Eat Here - Get Gas" -- A sign at a gas station.
Just the chicken." -- The response a waitress gave when asked if there were any dairy products in a soup.
"Parking for drive-through customers only." -- A sign at a McDonald's in California.
(Via UNLV professor Patti Shock.)