Some stickers from Russia (of course, they lose a lot in translation):
"Can't pass? Try to jump over!"
"This bellybutton is not for free"
"This car is insured and mine studded"
"I'm blonde but I'm not stupid" (sticked upside-down)
"Pedestrians are quick or dead"
On driver's door 5 small emblems of Mercedes (or BMW) like number of victories on planes.