This is a video of an epic speedrun that took place in AGDQ 2014 (Awesome Games Done Quick), where people can donate during these runs for charity.
During this run a donation of 10000 (!) dollar was made by the creator of Minecraft. (@ 26:40 in the video)
I watched this live on Twitch when they were doing the run, it was an amazing run.
Lots of cool glitches to see, and various tricks. Awesome for SMB3 fans.