Is the Red one covered in paint stripper and covered in sharp pointy metal scratchy bits?

I’m not sure that if someone is trying to kill me with their wheeled metal box that I’d have time to delve into a pocket to retrieve a magnet and then lob it at a car.

A loud sweary shout and maybe a slap of hand against bodywork is much more immediate (and satisfying!)

It would only wind them up even more if their car was actually touched by a cyclist as well as ‘held up’.