Strict Typing

A guy calls a plumber because the plumbing in his house is backed up. The plumber answers the phone, says "My name's Joe, I'll be over in a few minutes".

A plumber arrives at the door a few minutes later, the homeowner answers the door, "you're Joe, I presume?" The plumber answers "ahh, no my name's Jimmy. Joe had an emergency, so he sent me over instead. Funny 'cause Joe's a competitor of mine."

The homeowner gets his shorts in a knot and sends Jimmy away saying "I called Joe because I know he's a certified plumber! If you're name's not Joe, then I don't want to see you on my property!" He then calls and reschedules a later appointment with Joe...

What the homeowner won't discover is that Jimmy

1. does better work than Joe
2. costs 20% less.