The episode centers on Skips' pride and a tragic accident that occurs during an arm-wrestling match:

"[S2E21] Over the Top " is a high-stakes, fan-favorite episode of the animated series that originally aired on May 23, 2011, on Cartoon Network . In this episode, a casual test of strength takes a dark, supernatural turn, forcing Skips to gamble with a soul to set things right. Plot Summary

During a visit to McHooligan's, the park gang is boasting about Skips' legendary strength. Rigby challenges him and, surprisingly, wins easily. Stung by the loss and obsessed with his tarnished pride, Skips discovers Rigby cheated using a device called the "Playco Armboy". In a fit of rage during a rematch, Skips slams Rigby’s arm so hard he accidentally kills him.