The only thing worse than getting killed by a subway train while taking a leak is getting killed by a G train while doing that:

A man was struck dead by a train as he was using a Greenpoint subway tunnel as a toilet yesterday, police sources said.

The unidentified man was in the tube for the G line near the Greenpoint Avenue station relieving himself around 5:30 p.m. when an incoming Queens-bound train struck him.

Witnesses told cops they had seen an intoxicated man climb down into the tunnel shortly before the incident.