Current QuickPoll results for 248 entries:
Two CD's at the same time, ...nope, and that's not called "quad" either.
When you make two identical versions, ... using a stereocopier?
Fawn's bunny, ...the wittle wabbit's soooo cute!
Fawn's twin sister's pet name, ...seeing double was never so much fun!
Anything they say it is, ... in this or any other three-dimensional universe.
(May not add up to exactly 100% due to rounding, and the warping of space-time.)