I’ve always been a fan of visual gags, and one of the best is funny signs. Billboards are great but if you want a nice deep guffaw you can’t go wrong with church signs. There’s something about them that makes them both great sources and fodder for humor.
There’s a great collection of sign generators for church signs and community bulletins. I thought I’d throw a few I made up. I’m not sure if you can post images in comments but you can always shove them up on hosting sites and give us some links.