This video has been doing the rounds for ages, but I have a hard time believing that the cat was actually on LSD. The description posted by kenzomatic completely contradicts what is seen in the video, as do the experiences of anyone who has actually dropped acid.
It looks more like one of those anti-drugs propaganda films, and the credibility of the material isn't helped by the fact that it has In-A-Gadda-Da-Vida on the soundtrack.