A multibarrel paintball gun, with pellets of:
Paint
Paintstripper
Special pellets that unfolded into a round sticker that read "I'm a lousy driver" or similar.
CALLING VIKEONABIKE!
Most paintball guns are not replicas of actual firearms, and could barely be confused as such - especially if one was to colour them in two tone hivis.
Would it be inherently illegal to have one slung over your back when riding?
Using one on the other hand ... but y'know, this is just a theoretical question
