Like Snape
This is my favorite song from Potter Puppet Pals, though it ties with Mysterious Ticking Noise. It's not from any episode, but it was in Yule Ball 2007 (I think). And I didn't want to give you guys a stupid lyric video, so I found a good music video for it.
Just like Snape's button poem from 'Snape's Diary,' this song makes me want to laugh and cry at the same time. It's just so accurate in both a funny and sad way. And what's especially sad/funny is the monologue that comes before it in Yule Ball 2007, which is: "Have you ever had a bad day? ...Have you ever felt depressed? Like the forces of the Universe were forging together with the sole purpose of making your life miserable? If you feel like that every day of your life, you must be like... Snape."
And then after the song, Harry and Ron attack Snape by repeatedly pushing him to the ground and going "Bother bother bother bother bother bother bother bother bother bother bother bother bother bother bother bother bother!" Which, yet again, makes me both want to laugh and cry.