At party’s we used to see how long people could last in a floating live room at my old studio. Not quite an anechoic chamber, it was essentially a box wrapped in rock wool sitting in another box. Very very quiet & with the lights out you definitely had an uncomfortable feeling.
For me, after a while, the walls just dissolved & the blackness went on forever.
Wouldn’t want to do it after watching a horror movie 
ooh, dudeeeeeeeeeee … you call that a “party” … rofl … hope i never get invited …muhaaaa… well on the other hand, why not try it out… funny story!
Ha you got me good
Yeah we’d generally do it before people got (too) mashed.
You never know who you’d find yourself in there with later on or indeed with what, but that’s another story…