Here's a website I just discovered...it has user-submitted photos of funny signs from around the world.
I've seen some funny signs in various places, from "Resume Legal Speed" to "? -->" (a question mark above an arrow). I submitted my Harris Teeter sign photo, but I'm not sure if it's been accepted.
Sign Spotting: Funny Signs from Around the World
Update: My photo has been accepted. Here's a link to it: http://www.signspotting.com/no-loitering-when-2/
I'm not sure how it got to be in the "Accidentally R-rated" category...an obvious error, but I thought I'd only checked the "Ironic" category. Oh, well.