First, take the unopened can of beer and pierce a shotgun hole in the side of the can, near the bottom. Without spilling, take a 1-2 oz. sip of the beer through the shotgun hole, you'll need the room. Next, pour the cold shot of Jagermeister in the can. Put the shotgun hole up to your lips securely. Tip the top of the can towards the sky, pop the tab, and chug.