This reminds me of a friend I worked with in an I.T. group years ago. He was a brilliant software and network engineer, but not very mechanically inclined. One morning he pulled his Camry out of the garage and noticed a part on the floor. That was concerning, so he stopped by the Toyota dealer to ask a service writer what the part might be. 'Looks like a roller off of your garage door' was the reply. He was a little embarrassed, but said the service department found it entertaining.