A guy walked into a bar with a banana on his head.
The bartender casually mentioned, “I don’t know if you realize this, but you’ve got a banana on your head.”
“That’s okay,” said the guy. “I always wear a banana on my head on Tuesdays.”
“But today is Wednesday,” explained the bartender.
“Oh no!” exclaimed the guy as he turned pale. “I must look like a complete idiot!”