Here it is: Gerhard Reinke's Wanderlust.
P.U.B.E. shows up at 6:40 in this first part. The scene is not as I remember, but it's still f-ing funny.
GR: "Ze pyoob!"
Soldier: (hits him with rifle butt) "Poo-beh!"
GR: "Ze poo-beh!"
And: "But zey von't succeed, due to the heroic vision of ze pyoob!"
...the rest of the episode is linked via the video. Don't be drinking or eating anything when you watch it.