One of the students in my department was smart and driven, but also really awkward. I had known him perhaps better than most other students, and had gleaned that he was depressed and had low self esteem.

On a few occasions he tied a noose out of an ethernet cable hanging from the ceiling and played "Pumped Up Kicks" when asked to choose a song at a party. Really strange stuff. If we had been betting on who would turn out a school shooter, I would've put my money on him.

Anyway, he graduated last year and this year I found out federal agents raided his home because he was building pipe bombs and intended to kill a bunch of people and himself. He's now doing at least 10 years in prison.