Back in college I helped out any of the foreign students who were having trouble with math or history. I actually really tried to help them, except the Iranians. Those guys were arrogant and lazy, so I'd deliberately try to fuck them up. Seriously, fuck them.
Oh, and back when I was a high school senior, this goofy freshman had a locker right next to mine. One day he was panicking because he had a test on The Scarlet Letter and hadn't read it, so I helpfully let him know that the Scarlet Letter was A, and the A stood for Asshole. He was skeptical, but I convinced him.