Theres another one as well started its rounds, all they have to do is blow it in your face, not to go off topic but its quite scary
http://topdocumentaryfilms.com/worlds-scariest-drug/
So you blow powder in her face then have your wicked way.
Emm I wonder if flour would work.
Blow it in her face (aim for the eyes) and while she's blinded have a fumble and then run like the clappers.
Just a thought.