I always weirdly loved Gotcha! Probably not enough to consider it my favorite but like, maybe in my top 5.
LSP actually got some genuine, meaningful development beyond being a shallow, bitchy valley girl (that obviously didn't stick at all), there was a fun adventure and some fun laughs, but I think it's mostly because it was practically fanservice with how nice and cool Finn was, even got a sexy hair scene and battle scars in the fight. Probably a shallow reason to love an episode but I still remember really enjoying it.
Also there's this lovely piece of music in it that I always wish was isolated, it's so catchy.
https://www.youtube.com/watch?v=0dFgNM79wcI 
