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I had a mild nightmare that I came across a hazardous cryo setup at work that I tried to fix: a decent-sized flask of liquid argon (think backyard propane cylinder size) with the gas vent hooked up to a big gas storage cylinder (think stationary propane tank feeding a house size). Flasks aren't rated for pressure so I closed the shutoff valve on the big gas cylinder and starting demating the flex line so the flask could vent and not explode. But when I pop the B nut on the fitting it just starts blowing like the flask was just filled with gas and no liquid. I look down at the flask and realize it's actually a gas accumulator and that the big cylinder is actually a storage flask (meaning it's the one that's full of liquefied gas), oh and I was wrong: it's not filled with liquid argon; it's full of liquid hydrogen! The accumulator was there to collect the boil-off because you can't just vent hydrogen, it's a fire and explosion hazard.

So now I'm having a huge "oh shit" because a) I've just vented a decent sized cloud of hydrogen gas and b) I've closed the vent valve on a huge flask of liquid hydrogen so now it's warming up and pressurizing. I hear a pop and hiss and see the safety valve on this thing has just cracked open and is letting out some more hydrogen gas. I start trying to get the accumulator hooked back up but the flare seal on the fitting split when I pulled the line. There's an assortment of new seals on the rack but as I dig through them frantically NONE OF THEM ARE THE RIGHT SIZE! Meanwhile, that hissing is getting louder; is that valve properly sized?!? Is this flex line sized for the huge pneumatic load I'm about to put onto it?!? Should I just crack open the shutoff valve so the flask vents, upping the fire hazard but mitigating the immediate explosion hazard? Who built this thing anyway?!?

I wake up. Awake realizations:
1. There's no way I would've mistaken the fluid and this thing had no business existing anyway
2. The accumulator would've been at pressure equilibrium with the flask so absent some kind of pump it shouldn't have worked the way I dreamed
3. I need to stop watching NFPA lessons learned videos on YouTube
4. It's 6:30 AM and I need to go to work soon; early morning training is the worst

@primesuspect said:
What I do to cleanse my system is this:

buy a bottle of generic fiber pills (the generic equivalent of Metamucil caplets)

take literally 40-50 of them before bed

Have a satisfying dump the next morning

do it again that afternoon (you've basically crammed the whole bottle in two days)

big time poop-o.... BIG time that night or the next morning. One time I did this and a fleshy, lined tube came out of me. I mean, seriously. It looked like a pork sausage with a clear, almost see through skin, filled with chunks of ... well, crap. It was about 12 inches long and just massive. I felt so clean. It's like a mucoid lining or something, I'm no doctor, but man it works.

Fifteen years ago. #neverforget