I've always been a huge fan of "The Scotsman." My favourite rendition is a Techno-Pop dance remix done by the Brobdingnagian Bards that they called "The Scotsman Unbound."

I do really like "Donald, Where's Your Trousers?" and "What's Up Yours?" but I also really like "Highland Cathedral" (especially when done by a lone piper - sends shivers up my spine) and "Flower of Scotland."