According to the BBC:
The men volunteered to be "guinea pigs"”.
I would just like to assure my readers (AMToNW) that if, as a result of ingesting hallucinogens, you perceive yourself transmogrifying into a rodent, then you are in possession of some ‘bad acid’. Fortunately, these symptoms are rare, (although my friend Dave was once attacked by the Incredible Hulk on a dark day in 1971).
If you choose the time and environment carefully, an LSD trip is a deeply meaningful experience which will expand your consciousness and turn you into a fine upstanding member of society. It may, however, have some unpleasant long term effects, such as being so deluded as to think that what you write is amusing and of interest to others.