Portal
It was during gym (duh) and I was in the locker room talking with a friend. Somehow the conversation went to cracking locks, and how you can crack a dial lock by listening for clicks, so I went to a random person's lock and tried it. It actually works...in a few minutes I had unlocked the lock off the previously locked locker now unlocked with no lock.
Anyway, I heard three clicks within the lock while I was turning the dial, and the dial tightened as you turned it closer to the number. I've never noticed that kind of thing before. Now I feel evil. 
Eh. I'm too lazy to look up my grades.
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