Possible?

[happynot]

I have seen a movie recently I think it was hitman and it showed that they put a bag into smba head he gradually stopped breathing is that possible? If I put a plastic bag in my head and have taken smt relaxing will it work? Ex.a sleeping pill or it will fail?
Looking for smt non violent, and that seemed pretty ok but I was a movie

 

[Worndown]

Duplicate post.

 

[happynot]

Lsorry didn't know how to delete the other!