It's thirty minutes long, but my God, it's worth every minute. Every second. Just go watch it.
Or, if you'd like to settle for something shorter, here are a few of my recommendations:
Yoshi's Island 2
Anything by Legendary Frog
Link's Quest For Ass
Link's Quest For Ass 2
The Cheese Family
Be Prepared...For Ralph Nader
Yoshi's Island-Vgdc Final (a.k.a. the 'Kill Baby Mario' game)
Most of you guys have probably seen most of these...but I felt the need to share them in case you didn't or just wanted to see them again. Or a miscellaneous reason.