This one comes from my Dad and his eccentric friends.
Ruth loves to run so her husband bought her a treadmill. He was reading the directions and getting it all set up. Now, this guy has his PhD in Physics and is (at least in academia) brilliant. The directions said to 'keep the machine well oiled'. So he gets out a rag, dips it in oil and proceeds to run it over the entire surface of the machine. When Ruth got on it give it a test run she slipped all over the place.