Muffler Belt
Along the lines of Blinker Fluid, it is used to confuse people who know very little about cars. This belt does not exist, as it would be unnecessary to the exhaust system.
John, "My car started sounding funny on the drive over."
Dave, "Did you remember to tighten the muffler belt within the last 3000 miles?"
Dave, "Did you remember to tighten the muffler belt within the last 3000 miles?"