Reader Molly has directed me to her blog post pointing out two rather delicious signs. In fact, they're so good I'm reposting them.
This is perhaps a classic example of quotation marks that could be interpreted as a wink. "Be ethical"...
I like to believe that the maker of this sign was skeptical about exactly how slippery the floor was, and made fun of the sign-designer who is clumsy.
Técnico "de verdade"
3 weeks ago