A few years ago when I didn't have any experience in saltwater, a customer asked me if he could put some fish in his tank. I asked him what he had, he listed a few different kinds, and I went to ask my manager if they were compatible. She said his wrasse might pick on whatever he was wanting to add.

I walk up to him and say 'You better watch your wrasse.' And then I laughed because I realized what it sounded like. Not really stupid advice but I felt stupid after I said it.