Heh, I have a good story:
A number of years back a friend of mine was sectioned and thrown in the loony-bin for a court-ordered stay after a couple of weeks of extremely erratic behaviour, mainly due to his (ab)use of methamphetamine. All in all he didn't need to be in a psych ward, however as a way to force him to take a enforced break from meth it worked well (he doesn't really take meth anymore, certainly not like he use to- he claims he once didn't sleep more than 8 hours a week for a month, and I'm inclined to believe him).
So anyway, as he wasn't actually psychotic (well, anymore) yet was still trapped in psychiatric limbo for an abritrary period of time the logical thing for him to do to pass the time was smoke pot. Anyone who has been to prison knows the benefits of cannabis' time-contorting abilities. He was actually buying weed off multiple people when he was sectioned- for whatever crazy reason he was allowed to keep his cellphone and one of his pot dealers (who he was friends with, but still...) would deliver to the institute (as in, sign in as visitor deliver- not throw into courtyard or some shit) and he was also buying pot off this guy who was visiting his girlfriend who had also been sectioned.
The first couple of weeks, as you'd expect, my mate was extremely paranoid about his pot smoking. He was locked in your rooms at night, but they were single occupancy and had strong extractor fans and coverable smoke detectors so he would stand on a chair and smoke right by the extractor duct...but by week three he had a repore with the entire staff, was almost acting like an orderly and it was plain to him that noone was gonna give a fuck, even if they worked it out. So he started just smoking in the courtyard, obviously keeping a look out, but all anyone did was smoke massive rollies that looked like spliffs anyway.
At first, particularly for me, a non patient, getting stoned with a patient in the main courtyard of the psychiatric instiution in my city was novel as hell. After a month of smoking weed in the psyche institution the thrill was pretty much gone- it was time to do something really daring and stupid.
So we hotboxed the staff bathroom. In a psychiatric institution. Neither of us had been smoking pot for that long, so needless to say by the time the baseball bat of a spliff was stubbed out we baked as fucked....so baked he hit the emergency response button in the bathroom instead of turning off the light. Although not part of the plan, summoning nurses to the room we had just hotboxed -smoke still hanging in the air- was the fucking icing on the cake.
That's the only really 'interesting'/funny one I can think of. I mean, falling into a K-hole while sitting infront of a pokie machine in Hong Kong & spending like 6 hours snorting bumps of K off the machine is funny- but I would say a hell of a lot of drugs are consumed in casinos. Just generally in the toilets, not infront of the staff (Hong Kong was a magically fucked up place before it went back to the PRC).
I've also smoked weed in multiple police stations & courts- but that's been at protests. A NZ cannabis activist made a cannabis smoke bomb (like an automatic-vaporiser that took about 1oz at a time and poured smoke out of 4 pipes- so it would both fill a room/building and could be used as a industrial-strength vape), put it in a shopping trolley, wheeled it into the police station and let it off. There's good film, I'll post it if I can find the link.