Burned by a Margarita

They don't teach bartenders that? I was told about it in school on many different occasions; first was in the second grade when we for some reason were handling limes. Second was in home economics. Third in biology in senior high.

I am curious, doesn't most people know this?

Didn't knew it, but a fig tree send a friend to the hospital with the same trick, delivering several weeks of excruciating pain and leaving permanent scars in his arms. Is impressive if we think about it.