When did you realise you may be watching the greatest tv show of all time?

For me it was in episode 3 of the first season "Dead in the Water". A little context, the first ep I watched was ep3 S1, and I remember being so hypnotized by what I was watching that I could barely blink, I only watched this episode because it was on free-to-air TV, then after that I got kind of obsessed and asked my mom to pay for the streaming service so I could watch it lol... After paying, I started watching everything properly, and then I was sure that this was the best series of all time (I only watched it once, but I intend to watch a lot more! I just need to get over that ending first)