Man, some good ideas here. I was thinkin for mine when it runs:

SLO 240 (D)


but modifying someone else's idea I like:

KLA CKY

KLCKLAK?

my favorites already posted:

PAS SME
DEE SUL
BLOCOAL <--lol

Traffic in Tucson moves pretty fast, so a vanity plate with a clever reference to your lack of acceleration would be actually pretty useful I think ^^.