Folding Bottle

This guy goes along to the Patent Office with some of his new
designs. He says to the clerk, "I'd like to register my new
invention. It's a folding bottle."

"Ok," says the clerk. "What do you call it?"

"A fottle."

"A fottle? That's a stupid name. Can you think of something else?"

"I can think about it. I've got something else though. It's a
folding carton."

"And what do you call that?" asks the clerk.

"A farton."

"That's rude. You can't possibly call it that."

"In that case," says the bloke, "You're really going to hate the
name of my folding bucket."