It's common with the under 12 set, but I have seen adults do it, too. I don't need to hear them to tell what they're saying. Seeing this makes me chuckle.
My kids, because they usually are ferried around in a Beetle, never really knew of the game. Until recently, that is. Chef Jr has been in the car a couple of times lately with his best friend, and his best friend's family is big on playing punchbuggy.
Tonight, we're driving to scouts and a block from our house, Chef punches me in the arm and says "Yellow punchbuggy, no punch backs." He did not listen to my argument that the owner/driver of a Beetle is immune to Punchbuggys. He told me that I was not immune.
Poor kid. He didn't realize that I knew of at least five Beetles that were parked along our route.
Punchbuggy Luna Blue, no punch backs!
Punchbuggy, Yellow, no punch backs!
Punchbuggy Blue, no punch backs!
I felt bad for him and pointed out the green one behind us at a traffic light.
I think he'll stick to playing punchbuggy when he's with his friends!