"I put instant coffee in a microwave oven and almost went back in time."
I remember at the company I used to work, we were testing the computers to see what effect the Y2K rollever of the computer calendars would have on applications.
So we set the mainframe calendars to 2020 and restarted. The thing was, though, there was some error correction we were unaware of in the code which, rather than let us go to 2024, 'corrected' the year to 1924.
I didn't realize what had happened until I came in to work the next day and checked my email. I had messages from Dorothy Parker, Sinclair Lewis, and spam from supporters of the Scopes trial. Damnedest thing you ever saw.