For me it was GoT, I just thought the miniature landscapes looked way too cool. Also I am watching Kimmy Unbreakable which has a theme song that I think is pretty catchy.
If you happen to remember which episodes, please let me know! I haven’t noticed that on any of my pass throughs.
My mind was blown while re-watching The Wire (where I also never skipped the intro). I said to myself “The singers change but the song remains the same.” Then my brain blew up because that’s the entire point of the series.