Had 13 because i'm not superstitious and it looked like nobody else was running it when I started doing trackdays 5 years ago, then I went racing and 13 was taken, so was 113, 213, etc, so I ended up with 513
I picked number 420 because... uh, I can't remember. Wait, what's my number? And yes, 420 is my CCS race number.
Jason Farrell's first number was 420 until everyone wanted to get high with him after the races. he did't know that at 4:20PM a bunch of stoner HS kids went up Mnt Tamalpais to smoke dope after school each day. my family is from Mill Valley so I skate boarded down that mountain many summer days. http://en.wikipedia.org/wiki/Mount_Tamalpais