Heating and Air Con Engineer
 

Joe was a heating and cooling technician. His assistant was a small chimpanzee he had trained to do all the duct work.
The chimp had no fear of heights or confined spaces, and besides, he didn't have to be paid.

One day, he got a call from a customer who said his air conditioner had broken down.
Joe went over and discovered some defective ducting. The customer asked if it would be hard to fix.

"No problem," replied Joe, "I have a little duct ape that will take care of it!"