Sick from the head?

Do you reckon you could make yourself sick with a thought? I mean physically throwing your guts up type of sick. I'm not thinking about self induced paranoid sickness, but sitting there concentrating on being sick until you are. I really want to try it, and I think I can do it....but that desire is only just beaten by the fact that I really don't like being sick.

It's weird I can feel it coming already. How cool is that?....now I really need to stop.