If this was an attempt to settle scores with life, then not the most successful. The dude jumped onto the rails under a passing subway train. But either he changed his mind at the last moment, or he did it out of hooligan motives, but this idiot remained alive.
The video shows how the dude jumped under a passing train and tucked his legs up so that the train passed over him. This guy was quickly pulled out from under the cars, but there is no reliable information about the reasons for his act.