Greatest rock song of all time. It was orginally written by Bob Dylan, but the famous (and best) version is the one performed by The Jimi Hendrix Experience, which contains an absolutely mind-blowing guitar solo which is widely regarded as one of the best of all time.
One member of the party lies in supine position and receives the fecal torpedo from someone else positioned above their face. The challenge is to dump perpendicularly into the mouth of the recieving partner in order to create a perfectly vertical watchtower.