He had climbed onto the fire escape, shinned up a drain pipe and hopped onto the roof.

The drain pipe doesn't so much carry 'waste' as condensation from the evaporator.

He runs off as the rain starts, hides in a drain pipe, but gets caught in the streaming water.

These foundations extend below the frost line and may have a drain pipe which helps groundwater drain away.

These devices avoid negative pressure in the drain pipe by venting room air into the drain pipe (behind the trap).