http://www.bikerjewelry.com/stickers1.htm
Reason #16 : If not for helmets, where would you put all your helmet stickers?????
I don't have the time to go through and read every one, but I've got a sticker on my helmet that I got years ago, from either Superbike or Fast Biles magazines (both are British motorcycle mags). It says (in small letters),
If you can read this, my head has come off, so it might be a good idea to call an ambulance.
Mark