I looked for a picture of this but couldn't find one anywhere... Suffice it to say it was taken from a Pearls Before Swine comic.
Pig goes into a diner to get something to eat. A waitress comes over:
Waitress: "Welcome to Mr. Korba's diner. Are you ready to order... what's that on your head?"
Pig: "Oh, that. It's a wig. I'm going to a Halloween party dressed as Ronald Reagan."
Waitress: "Oh. Well, are you ready to order?"
Pig: "Not just yet. Give me a minute."
Waitress: "Okay. When you get ready, just give your order to our chef over there."
[There is a large sign on the wall above the chef that reads, "Whaaaaaaa?"]
Pig: "What's the sign for?"
Waitress: "Oh, that... Our chef is a very mean person, and hates all these custom orders people make. So he put that sign up so he could just point to it and say, "Whaaaaaa?" as though he doesn't know what they're talking about when they order something not on the menu."
Pig: "That's terrible! I'm going to have a word with him..."
He walks over to the chef, and says the magic words...
And if that didn't make you groan, nothing will.
