The director allowed the actors, particularly Dane Cook, to improvise extensively, often diverging completely from the script. He would sometimes run 20 or more takes, letting the performers do something different every time, before settling on a few of those ideas in order to get pick-ups or close-ups. This made life particularly interesting for the principal and background actors in the scene with Dane, as well as for the prop and sound personnel.
The word "tank" denotes a role played by a team member in a massive multiplayer online role playing game (MMORPG). The duty of the tank is to attract the enemy's fire and absorb large amounts of damage which allows other party members to freely engage the enemy. This has some parallels with the role played by Tank in the movie.