Back in the day when I managed a little grocery/deli combination I was stupid enough to put a little note on the shelf that held all the cleaning supplies that said, "ammonia and bleach: give it a whirl." After a very frightening call from the paramedics on my day off about an employee who had done just that, the note came down forever.

I came away with a new respect for the responsibility that comes with subtle sarcasm. I still can't believe that actually happened and it was all my fault.