I have PTSD flashbacks over the Skype ringing sound. I haven't used Skype in about 2 years now.
Wow you make me think about how interesting it is to "time-travel" through specific sounds. In a couple of years this would be heard only as retro for some people but you'll be getting those flashbacks, if we had decided for messenger chat maybe people could be remembering their high-school days O.O!