Went to the washroom five minutes ago. Locked the door from the inside because I'm living in a dormitory and the washroom is public. It locked just fine, but it won't unlock no matter what I did. After several tries a frustrated me gave the door a hard kick. BANG!
And it opened.
And there's a girl standing outside, a hand rased as going to knock, eyes as wide as saucers.
I fled as fast as I can.
Conclusion:
1. Make sure I know the lock won't stuck next time I lock something.
2. Don't stand too close to the door.
3. Sometimes violence is useful.