Over the years I've seen a number which have made me laugh. A famous New Zealand one from the 70's.

I'm a regular Kiwi
that eats roots and
leaves.
(for those who don't know, root, is slang for fuck in NZ)

But personally I'm trying to find the following one to wear to work

Nobody
knows
I'm a
Lesbian.


And we also have an ice cream in New Zealand called 'Frosty Boy'. And on the side of their trucks is the logo:-

Frosty Boy,
Often licked but never beaten.