Just a very quick anecdote:
Yesterday, my department chair came in to evaluate my teaching. As a tactical move, I alerted several students in my class that would be visited that I was going to be observed. The subtext to this was, "Please, for the love of God, don't do anything to make me look incompetent!"
When I told one student, he looked at me and deadpanned his response. "Don't worry Mr. Duns, I won't do anything to make you look bad." Relieved, I said, "Thank you." Sandwich in hand, he continued, "I mean, if I didn't like you, I'd throw you under the bus."
This response from a student - who'll become either a Jesuit or a very powerful attorney - struck me as absolutely hysterical. I have little doubt that, had he taken the notion, that he could well have "thrown me under the bus." I have been chuckling over his response since yesterday and I thought others might find it amusing, too.
Incidentally, I don't think I'd ever heard this phrase until I encountered it on Top Chef. There was one season - with Marcel, if I recall - that it was used rather frequently. Since then, I've noticed that it gets used fairly frequently. It's a great phrase and one I might like to use more often. But to hear it out of the mouth of a student....hysterical.