Guy goes to the Patents Office.......

He tells the clerk "I'd like to register my new invention, a folding bottle".

Clerk: "Oh yes, what do you call it?"

Inventor: "A fottle."

Clerk: "That's a silly name, can you think of something else?"

Inventor: "I'll think about it. I've got something else here, a folding carton."

Clerk: "And what do you call that?"

Inventor: "A farton."

Clerk: "That's rude, you can't possibly use that name."

Inventor: "Gee, you're probably not going to be like my folding bucket either!"

H/T DML