The ending is somewhat of a steal, but better out than in I suppose.
Int. Bike Shop
Rich (40) walks into the shop. Behind the counter is the owner, Henry (35).
Rich: Hello, I'd like to buy a bike.
Henry: And why not, sir!
Henry goes under the counter and pulls out a pike which he slams down on the counter.
Rich: What's this.
Henry: I'm sorry?
Rich: This! What is it?!
Henry: It's what you asked for.
Rich: No it isn't.
Henry: It is! You asked for a bike so I gave you a.....I gave you a....pike. Ah.
Rich: Exactly. It's not a bike is it.
Henry: It has got 21 gears though.
Rich: No it hasn't. The pike is propelled by fin undulations, certainly not a derailleur gear shift system.
Henry picks up the pike and smacks Rich round the face with it. Rich falls to the floor.
Henry: Smartarse.