Dial Up. Yeah I know the sound and I know the time it took to load anything with. But it’s something I won’t ever miss having. I would much rather be on a 1MB connection if I had to choose between that or dial up ever again. I also hated how easy it was to be kicked off, if anyone called the phone, you were off it in seconds.
On the other hand, I do kind of miss the episodic scifi like star trek TOS or TNG. These days they’re all 40-hour long stories instead of 20 half-hour-long stories.