Back in 2005, Ian Hecox and Anthony Padilla filmed a video using a webcam set to the Mortal Kombat theme song. It became a hit almost overnight and today has over 14 million views.

https://www.youtube.com/watch?v=UMf40daefsI

The two went on to make several other videos that used themes like

Power Rangers

https://www.youtube.com/watch?v=agEjzQLiuGA&feature=channel

Teenage Mutant Ninja Turtles

https://www.youtube.com/watch?v=6D9p-wmtIJc&feature=channel

Pokemon

https://www.youtube.com/watch?v=mOX3OmUhQoo

Transformers

https://www.youtube.com/watch?v=ut5fFyTkKv4&feature=related

The two have since gone on to some internet notoriety as their channel "Smosh" on youtube was the most subscribed to channel from 2005-2008. They now have a website which functions much the same as the youtube channel, posting utterly ridiculous videos.

http://www.smosh.com/

Sorry about the video links not working as embedded, could an editor help me out, my browser is giving me fits. Thanks.