1) 51 things in my room. This thing has over 7000 video responses and over 2 million views. It's stupid yet at the same time kinda cool. I get the feeling that everyone that made a video response was like "yeah yeah, ms boxxy lookalike, I see your stuff" and then found themselves making their own little video a few minutes later. It's like Seth Green in Idle Hands except instead of strangling people without being able to control it, you find yourself posting Youtube videos without power to stop yourself.
2) I'll let Brett Elrich educate you on the similar practice of Haul Videos [click on thumbnail below to be taken to video in new window]:
[NSFW due to thumbnail?]