Lawnmower Deth, they arose from the mid 80s British thrash metal scene, and decided what metal needed was a really stupid band just singing about lawnmowers and vampire snooker players and sumo rabbits, and generally bringing a bit of cheer to a bloody miserable and angry genre.
Part of the reason I loved them is that they never allowed a lack of talent to get in the way of a great gig!
They're probably most "famous" for their cover of 'kids in america' by Kim Wilde:http://www.youtube.com/watch?v=iJz6_PEu6Iw
This is about as sensible as they get for original material:
http://www.youtube.com/watch?v=NqCA-3KTEkg&feature=related
A sample of their work would be the classic 'You've got no legs, don't come crawling to me' which was just the title repeated four times with a tune behind it, a typical 'track' was about 30 seconds, heh.