Giving your own military members LSD-25 — otherwise known as “acid” — is something that, believe it or not, the Nazis dreamt up. The British followed suit (and eventually so did the United States) and their tests can be viewed in the following footage, from 1963.

Basically, the Brits were attempting to study the effects should they turn the drug onto their enemy, i.e. chemical warfare.

The narrator actually says this in the clip:

“Fifty minutes after taking the drug, radio communication had become difficult, if not impossible. But the men are still capable of sustained physical effort; however, constructive action was still attempted by those retaining a sense of responsibility despite their physical symptoms. But one hour and ten minutes after taking the drug, with one man climbing a tree to feed the birds, the troop commander gave up, admitting that he could no longer control himself or his men. He himself then relapsed into laughter.”