One of my favorites was a lone sign in a vacant lot down the street from my apartment that simply read "Do not remove this sign." I wanted to take a picture of it for weeks but never remembered to bring my camera. And apparently someone didn’t heed the sign's request because the sign was gone a few weeks later.

Also, I know it's fairly common to have "Wrong Way" signs at the ends of on-ramps and exits in most places. But in New Mexico, we have "Wrong Way" signs posted every few miles in the medians on most stretches of highway. I always find that mildly humorous and terrifying at the same time.

- trs