Inside a dark and silent cave
he heard the sounds of pain,
he'd ventured far, a man so brave,
had thought it a small drain.

Without a sound small geysers spat,
the path lost all its friction,
no need to smell an ugly rat
or face post-haste eviction.

The fit was snug twixt tepid walls,
the ground now wide awake,
he'd left outside his trusted balls
in case there was a quake.

Herbert Nehrlich

http://www.poemhunter.com/poem/caveman-2/