I was stopped behind this sign company van on Victory Blvd. The graphic on the back doors caught my attention: Wile E. Coyote at a cactus payphone (sure) holding up a sign that reads "HELP." What other kind of a sign (or awning) would Wile E. need?
The kind that (he thinks) catches a Road Runner. In fact, signs of all kinds run wild in the Road Runner series, and plenty of other Looney Tunes cartoons. Check out Chariots of Fur from 1994 (7 mins.):