I never saw S1 til after I'd seen most of the rest of the series, so I knew what was going to happen, and specifically I knew about Denise Crosby's wave in Symbiosis. I therefore recorded Symbiosis from the TV so I could go back and freeze frame it to see it.
This did have the unfortunate effect of meaning that Symbiosis was one of the very few ST:TNG episodes I had on video (along with Where No One Has Gone Before, for some reason), which meant that I ended up watching it again and again.