It renders you powerless...
Good advice, if you are a fan of the cult classic The Lost Boys. I am - love that movie - and remember very clearly that line.
I should know better. Terri can attest to the fact that I should know better!!! She and I were having a discussion the other day regarding weight, gains/losses and how all it would take is just one or two days of a tummy-thing to get me back where I'd like to be. She, smartly so, replied back quickly "Oh don't wish for that!!"
Its not that I actually wished for it, but heck, I put it "out there" for the forces of nature to take and run with!! Except they hit a target not of my intention - Christopher!!! I knew something was wrong last night when he did not want to eat and was fussy as all get-out. I'm now up to my elbows in laundry, my house smells like vomit, and I am, indeed, powerless.
I didn't necessarily invite in a vapire, but I think the Puke Fairy works off very similar rules of engagement.