These type of videos always crack me up. Remember that seen in "The Hangover" where Zach Galifianakis gets shot in the face with the taser? Yeah, It makes me laugh hard too. 

Well, we have a real life video just like the one from the movie posted below. It is of a cadet going through training where he had to experience what getting shot with a taser felt like. I think his reaction says it all.