How about
"I'm not loosing parts...
I'm marking my territory!"
On a serious note.
If you get Helmet Stickers, See if they can be printed on Reflective Backing/Tape...Usally most sticker places have this.
Similar to STREETGLO
http://www.streetglo.net/ or for the clubs
http://www.streetglo.net/streetglo_files/page0012.htm