Pranks
I love pranks.
They ground us in reality, make us re-asses our stupidity of seriousness and bring us back to the realization that we’re a bunch of atoms.
This is still my favorite prank of all time (and not just because my alma mater Yale rocked Harvard with it)…
http://en.wikipedia.org/wiki/Yale’s_%22We_Suck%22_Prank