"Don't wear your gloves outside the lab."
"Oh!" *takes them off* "Er... why not?"
"Well, partly because you don't want to get whatever's on your gloves on door handles that people are going to touch with bare hands."
"Ah. That makes sense."
"Also because it freaks people out."
"Oh." *sadly* "I always thought that freaking people out was the fun part of being a scientist."