Double Tap Root Beer is one of the Perk-A-Cola drinks in Call of Duty Zombies, granting players an increased rate of fire in exchange for points. Each perk machine plays its own distinctive jingle, and these tunes became part of the mode's identity as players shared gameplay clips, montages and streams online. The Double Tap jingle in particular is remembered for its catchy, old-timey advertising style, which contrasts sharply with the horror atmosphere around it. That contrast is why it still appears in edits, memes and throwback videos long after its original maps.