Besides SOMF I have seen:

DSPLN ME (discipline me, girl driver)

I LITIG 8 on black Porsche 911 (lawyer)

PUNKY QB on white Porsche 911 (Jim McMahon)

N2PLAYN on a Jeep Grand Cherokee(North Carolina plate)

N2MUD on a mud style Jeep CJ (Missouri plate)

SS CAM on a '72 Camaro SS/RS

SS CAM 2 on a Honda Accord parked next to the Camaro