To save time, i've made a list...
Any car with a fart can
FWD cars with a tall rear spoiler
regular cars with vivid colors (a Lamborghini can pull off lime green, not a Honda Civic)
duct tape used to hold something onto the car
duct tape anywhere on the car
vast majority of body kits
All cube shaped vehicles (Scion Xb, Nissan Cube, etc)
excessive use of chrome trim
ridiculously large wheels on a car (20"+)
spray painted steel wheels
mis-matched wheels (designs, not sizes)
cars with wheels that have the wrong offset ("skateboarded")
spray painted camo
heavy use of stickers/vinyls