ISDN was a true gamechanger for me. Before that, we had a 56k modem and I couldn't go online without blocking my parents' phone connection. Also, with ISDN came our first internet flatrate.
The 10m long cable runs across the hallway from the living room to the children's room. What a time to be alive :D Blocking the phone connection for 1 hour to download the 10MB demo of a game.
