jesus christ, I live by a firm principle of never giving anyone drugs if they a) are not aware, b)not completely happy to do them,
I think its a really wrong thing to do, slipping someone shrooms when they don't know theyve taken them, its easy enough to forget you've taken shrooms when hallucinations get strong, hence why some people panic, so imagine how much worse it is if they don't know in the first place the drugs they've taken.

Give it a think, I believe it was really inconsiderate and immoral to do so but thats just MY opinion.

Jonny