Non-sports fans will enjoy this one too. Thanks to the Brothers McCarthy for the tip.
I thought this was a joke, but apparently not according to the youtube description:
"low budget music video from the Glasgow Diamonds American Football team in Scotland, from 1986. The song is called 'Diamond Rap' and is sung by Paul Birchard. The video was made by Brian Keeley, and was voted best football music video by CBS Television and screened during CBS's Superbowl broadcast in 1987."