Yeah that’s what the dude said when he was showing us around, blew my preteen brain.
I recently watched an episode of Hamiltons Pharmacopoeia where this lady was talking about her experience living with the guy that made all the LSD for the south of Britain back in the day. She fell in love with a pigeon.
Anyway this dude was well into trepanning, thought it was a way to increase the brain capacity and expand the mind.
She ended up trepanning herself on film and releasing the footage, yeah they watched it on the episode.