Mostly interested into tragedy:
1. People trying to help others thus getting into no-way-out situations.
2. People getting into situations which they don't caused themselves.
3. A tale of Two Sisters
4. Oldboy
5. Sympathy for Mr. Vengeance
6. A ball, dropping down on the stairs and falling down, making you run after it but not able to catch it yet in sight.
7. A process you can't stop, like somebody marching forward - so in some way not the ball dropping down the stairs but someone pushing forward.