1. putting wheels on frames that weren't designed for them, front and back.

Like 20in rims on a track frame and running 100mm cranks.

2. downhill forks on newer track frames.

3. graphics on disc wheels

4. like chase's opinion on bottle cages/pumps, but taken to a herse/singer/ant level.

just trying to think of dumb things for people to do, except number 4, which i think would be awesome.