I have to say that YouTube (and Google Video) are like internet crack. Once you have a bit of time to troll through the contents, you can't stop and you can find some real gems. Some are funny, some are interesing and others are just plain puzzling.
For you today, I have found 2 videos, one showing a sense of humour, the other showing no sense of humour.
Sense of humour:
No sense of humour: