There's a frog crossing near my house.
It's got an ace sign with a picture of a frog on it and everything.
( TFD is sporting this season's finest necropants, Wed 3 Jun 2009, 16:26, archived)

How does the frog know? They can't read or recognise a pictographic representation of themselves.
When will the signmakers learn?
( FoldsFive, Wed 3 Jun 2009, 16:28, archived)