My brother purchased Magicka complete pack (all the current DLC's) and the things we do as opposed to what we're supposed to do in local co-op is hilarious.
Seeing as my character is wielding a Patriot staff (Staff with the Eagle on top wrapped in the American flag) that has the ability to throw "Liberty grenades" and an M16 burst fire, it's actually quite badass, until you deliberately hinder the progress of the story by throwing nades at fellow members especially when you try to BSOD a boss only to get yourself or your mate.
Crash to Desktop is probably the most spammed skill during our co-op so far as it targets anyone, friend or foe. The results... well whomever is targeted is flashed by a BSOD followed by their disappearance. Funny stuff indeed.
TL;DR Magicka co-op with the Vietnam pack + Crash to Desktop = LOL
*Player_1 casted a CTD on player_2*
*player_2 has left the game*