Sirens Of Titan

Kurt Vonnegut Jr
Wrote of a...
Chrono synclastic infundibulum

I did.
But then again, I didn't
And so did he/not.
And it wasn't, "Not-Done"

Simultaneously,
Together,
At once,
At the same time,
In unison!!

If you have never read any Kurt Vonnegut Jr
There is still time...sort of