My God, this was fantastic! Definitely the best one yet! I really liked the wacky character animation and Katy got some really nice character development. Everything really showed how hard she's trying to fit in and how stressed-out she is. Loved the guy throwing her off the table they were dancing on. The snow on the outside also looked really nice. I was pretty much expecting this episode. Every comedy these days decides to get serious at some point and introduce character development. You did that masterfully. I knew it was gonna happen from the moment it started when I saw the beautiful snow, but you still made this feel like it was Sublo & Tangy Mustard, not a different show. The whole thing was packed with some of the best jokes so far and the character development was delivered in such a way that it didn't stop Sublo & Tangy Mustard's antics. I really loved the escalation of the fight, especially Marvin breaking the plastic cup. Tangy Mustard's dancing and ability to get with Vanessica (great name btw) was also funny to me. The guy who brought the rock and Sublo's reaction to him were great as well. I also liked the more subtle joke of Sublo missing the meaning of Tangy Mustard saying "thirsty girls". Wubhammer's hobby was also really funny, and it really came around in the end.
Like I said, some of the best jokes yet and some wonderful character development and cool animation.