Socketboy
(Socketboy)
1
http://www.crayola.com/store/showdetl.cfm?&User_ID=7609437&St=8647&St2=-89868089&St3=60198077&DS_ID=3&Product_ID=529&DID=6
I got some and have used them on several occasions to leave people a message that park like selfish a-holes. Great invention. I got mine on sale for like 80 cents. But even at 4.99 I think it is worth it. The possabilities are endless with these!!! HAve fun 
Original thread: https://lowcaliber.com/eve/forums/a/tpc/f/7786011002/m/5526065385
Socketboy
(Socketboy)
2
Note if you can’t find these the “gel FX” markers work just as well
Manowar
(Manowar)
3
My girlfriend is an art student, she has those for other stupid uses, lol. Maybe I’ll steal a few for writing on cars 
Rhoedd
(Rhoedd)
4
Oh, my god! I need some of those. Seriously…
SHADY
(SHADY)
5
although sound in theory,
might result in injuries if implemented in certain geographic locations.
Socketboy
(Socketboy)
6
Yeah, just do it as you are leaving and try not to get caught