The Yuck Puddle is a grey blob seen in the men's bathroom at Paddy's Pub, although Charlie claims that it shifts around. To date, the Gang has been unable to clean up the yuck puddle, a task Mac describes as impossible due to it never drying up or hardening. Mac and Charlie believe it to be alive, because it bubbles in a way that makes it seem like it's communicating, and Charlie has found bones in it, which leads him to believe that it feeds. Charlie says that the smell that comes off of the puddle, if amplified by a fan, would clear out the crowded bar fast. ("The Gang Tends Bar")

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