Today a few of my juniors and seniors were going to a college fair. To prove that they had actually been there, and hadn't been off somewhere doing naughty things, I asked them to bring me back some of the freebies that the exhibitors were handing out -- more specifically, I used the word "shwag."
Apparently, the word "shwag" (also?) refers to low-grade marijuana. My students were like, "uhhh ... you want us to bring you back some WHAT?"
Duh, this is what i meant.
Amusingly enough, this is not the first time the students have had to correct me about this kind of thing. How fondly I remember the time in debate class when I suggested they choose as a topic the legalization of "cah-NOB-is."