As a compulsive photographer of odd signs, I have to say that "Brid" (origin unknown) has it all. It's the implied story I love:
Bob: Aw, jeez, you're kidding. "Brid?" Who made these things? Fine. I'll just put 'em out for $1.19.
Customer 1: Hey, did you see this? This bucket says "brid!" That's pretty funny! I bet they meant "bird," right?
Bob: Yes, sir, I expect they did.
Customer 2: Excuse me, but there's a spelling error on this product.
Bob: Yes, ma'am, we know. That's why it's on sale.
Customer 2: Only it's spelled "bird," not "brid."
Bob: Thank you, ma'am.
Customer 3: Sir? Sir? Do you sell any brid food to go in this brid bucket?
Bob: Very funny, sir.
Customer 3,487: BRID! What kinda idiots are you people anyway? Can't you spell?
Bob: We don't make the products, sir. We just sell them.
[Bob fires up the laser-printer, amends sign]
(Thanks, Fipi Lele!)
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.