Standard question to see if you're self-aware of your problems, and what you've done to deal with it. Totally bogus question to ask in an interview, but whatev:
"I'm sure you've heard of the term 'hangry'? Some people get a little irritable when they're hungry, but when I don't get a chance to eat, I get really mad and act out. Once, I woke up late and couldn't eat breakfast and had to scramble to get to class. I also had to finish up a lab report that was due in the afternoon and it counted for 20% of my lab grade so I had to skip lunch. Fortunately, I usually stash some protein bars at the lab, but my lab partner ate them, and when I got there, I got so mad, they tell me I went into some kinda rage, I kept punching him in the face until he passed out. So, now when I start getting hangry, I snap a rubber band I have around my wrist to distract me from getting mad. My flight arrived late so I missed the interview lunch today, and I was doing pretty good until I got into your office, because my rubber band just broke."