Renting/leasing a Nissan forklift to raise my amp while I dust under it.
Speaker grilles
Pop up ads on vinyl. They really mess with the stylus in a bad way.
Kiosks and/or self-service of any kind. It's really difficult to hold the mirror AND the Dremel during a DYI root canal.
Those who preach that the stuff inside our audio gear is created by a higher power and we mere mortals shouldn't mess with it.
Forums with no sense of humor.