This video is by Maggi137 at YouTube. It features clips from BBC Scotland's 1994 six part series "Takin' Over the Asylum". David plays a manic-depressive (bi-polar) patient in a mental hospital. He sings in it and has a pretty good voice. Get a load of that hair!
The music is a catchy tune called "The Lunatics are Taking Over the Asylum" by Fun Boy Three.
BUM ALERT: Watch for the shot of David's bum at 01:28. :-D