I've always found the "weeks since" (serious injury, death, loss of limb) signs at work sites amusing, and I've always wondered if while one guy is calling 911 another guy is running out to change the sign. Apparently the Penny Arcade guys wonder similar things.

Two groups that I certainly wouldn't acknowledge membership in:
In case you're not familiar with Mr. Astley's work And of course you can read up on him at Wikipedia.