Watch Out for Hop-ons!
Ultra rare0.9%Drive several miles with a Bunny on your car
The bunnies are the electric ball-like things which zip around the map in some junctions. They leap at and stick to your car (unless you have the LIM shield equipped and enabled) and require manual removal.
Note "several miles" is quite a long way, but this is cumulative - it doesn't all have to be done in one hit with one bunny.
That there are different bunnies which apply different status effects to your car; pick one with a positive effect (i.e. not the Broken Bunny!).
NB this *might* be cheesable by getting a bunny, getting up to speed, and then just pausing the game for a while (15 minutes or so). TBC.