The seat on every moderately sporty bike designed after 1992.
Origami folded plastic tanks, that look cool to 12 year olds with a Transformer fetish but a real PITA to find a decent tank bag for.
That Buells were made by Eric Buell & HD, not Kawasaki.
Every teenage wannabe stuntah that owned a 90's Kwak I was interested in, and thought that an iPhone & mismatched Harbor Freight imperial allen wrenches were all you needed to be a garage moto mech.
The idiotic wiring on early Victory's, so if you burned out a tail light bulb the whole bike would be dead.
The price tag of a Motus R.