Lots of good times on Skype in high school. Plenty of 12 hour calls on that service for free, and I really appreciate that it was a thing. It was really solid for the time. We had so much fun buying $10 of Skype credit when we finally were old enough to get jobs and then prank calling people over Skype. Very juvenile, but that's what we were.

Thankfully, P2P calling and video calling in general is a solved problem now with web standards included. I'm glad Skype was there when it was.