One summer
when I was teaching a summer course for some students
in the 12-14 year old range. One of the students asked a question
where I needed a dummy variable. So for illustration, I naturally
named it dummy. A day or so later the program director approached
me very concerned because the student had reported that I had called
him a dummy.
Hmm, it seems he really was ;)
After that, I'd happily rename the variable to "smart" and the student to
"fucking idiot". :)