I Have No Idea!

Origin

With the Valve's announcement that the online FPS Team Fortess 2 is now free to play, Valve also released the so expected "Meet the medic" video after a two year hiatus. As well as the others "Meet the" series, the original video achieved great popularity among Team Fortress players.

The Medic

A well known class amount TF2 players the medic the character shows a maniac personality and lack of concern about medical ethics, as shown on his "Meet The" video.

The Meme

Heavy -Doctor! Are you sure this will work?
Medic -Ha! I HAVE NO IDEA!

The first instance of the use of this scene was of the Youtube user 2007excalibur2007 on Jun 25, 2011.
The first video using the idea of the 'I have no idea' meme came from ZoomlessDude on 24th Jun. 2011 actually poking fun of the fact that Valve make Team Fortress 2 free to play.

Since then, many users uploaded the exact same scene but with some kind of question on the title, but he answer, remains the same:

The video is also used for responses or reactions on comment threads and discussion forums.