This is what happens when you yell out "Puddle" during the song In Summer at For The First Time In Forever - A Frozen Sing-Along.

So given that this video has gotten a million views (thanks, BTW), i'm going to explain this whole running gag.

So, why does Eric get mad when someone yells out Puddle during "In Summer" at the Frozen Sing Along? If you have seen the movie, the song is centered on Olaf's desire to experience the summer season. There is a problem though - Olaf doesn't realize that the heat of summer can be dangerous for him since heat and snow don't mix that well.

As for the origin of the Puddle joke, the thing was that someone before me posted their video where the one taping the video yelled out Puddle which led to Eric reacting dramatically. After that, I did it and it became a running joke, which started out slowly, but now that everyone's learning about this callback, it's become quite popular, and even more so when JoJo Crichton posted a TikTok video featuring his sister yelling out Puddle. What i did not expect though was that the whole puddle thing would snowball (no pun intended) into a runaway smash hit of a running joke. So, yeah...