A totally tangential reference but this reminded me of one that appeared on London roads on the side of trucks, but disappeared quite quickly - complaints, probably...
CHEVRON - JAM MAKERS SINCE 198X
(they were the company that laid out the traffic cones on the motorway/highway at the time)
I remember seeing a USAF pilot at an RAF base that had a bumper sticker that stated CLINTON HAPPENS during his tenure at the Whitehouse...