Supposedly, at the climax of the siege of Srebrenica, the Serbs dropped hallucinogenic gas shells on the fleeing Bosniak defenders.
However, like most events of that time, this history is somewhat disputed.
—
Also:
Thanks to an overdose of something that is not usually hallucinogenic in normal dosages, I once spent a night in hospital tripping balls while I was also at imminent risk of having an arm amputated.
Not recommended.
(I got through it largely by focusing on a Terry Pratchett book while trying to ignore the purple lobsters climbing the walls)
