I'm a bit younger, but early Ventrilo had a TTS that basically was so bad, and so easy to spam and break with nonsense that servers would either have it totally turned off, or kick/ban you if you spammed soi soi soi or something.
... And then of course.... there was that one time John Madden made it to the Moon...
Or.... you can turn it into music:
https://youtube.com/watch?v=T9vXGlaNKg0
I... guess you could call that TTS acapella?