Please Don't WHAT?

Please Don't  WHAT?
I walked by this sign several times during standardized testing at a local elementary school last year. After two weeks, I couldn't stand it any more and had to snap it with my camera phone and send it in to the local paper. Its appearance in the Contra Costa Times seriously distrubed several people at the school, but I just found it hilarious.

Cheers,
Peter Dudley
Walnut Creek, CA