Whats the most interesting bumper sticker you've seen?
Although no photos, I'll offer two:-
Seen on a E Type in early '70's showing 2 stickers;
the left one was 'Running in Please Pass, but this was 'struck through'!
the right one said "Run In, Now Try It"
Seen on a Chevy pick up in Arizona 3 yrs ago:-
"Alchohol and Calculus don't mix. Don't Drink and Derive"