Drinking Beer Inside Tank

I thought this was a hilarious scene also. Even though it's obvious this is fake that the guy is drinking from inside the tank, it's just funny to watch because of his facial expression. He looks determine as if he can finish the beer. I found out that after watching the credits at the end of the movie he was actually in a tank filled with water color. I thought maybe the whole scene was an animated scene with him behind a blue screen and everything around him computerized with graphics. When i took a closer look the only thing that had special effects was the twirling whirlpool going toward his mouth just as he is drinking the beer. There is nothing really spectacular about this medium shot except that it was a very funny scene in the movie.