I could believe it given a different setting and with some different circumstances. What you gotta realize is that even if this has happened in a bar there are a lot more people in a bar to chip in. 100% of the bar will not be chipping in there like in this scenario, I'm sure. Also they're drunk which means they're less inhibited, and they're at a bar in the first place which means they're probably less inhibited than your typical gamestop customer while sober even.
Then you throw in the chance that even if he had 100% willing people in the store there's a good chance there are a few people who don't actually know the lyrics of Don't Stop Believin (yes these people exist contrary to what some people in this topic might claim), not to mention the whole coordination factor of people singing in harmony instead of everyone just singing all at once in unison, and yeah, gets to be too much to believe. And while it's a nice touch from Pun's writers, the coincidence of using "Don't Stop Believin" as the song for this absurd story is too much to ignore as well.
Whereas with the headbutting a carjacker story you just have to believe Pun is that crazy and that a carjacker went after Pun's car. Not nearly as many assumptions to go with.
Though it all has me thinking that Pun is just conducting an elaborate social experiment to see how ridiculous he can get his stories until people call him on it. And so here we are.
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No problem!
This is a cute and pop genocide of love!