One of the interesting mix-ups involving us metallurgy types appeared in the magazine New Scientist over 10 years ago. When someone is introduced as a metallurgist, the other person responds with, "so, what is the weather going to be like tomorrow?" Of course, such a conversation (and the resulting mix up) is impossible now, because all of us metallurgist types have switched to calling ourselves materials scientists ...
"I have a friend/relative who studies insects."
"Like Indiana Jones? Do you have one of those hats?"
"I think shamanism is so fascinating, don't you?"
"ah... dinosaur bones. Fascinating."