That gives me a great idea!
Take her to one of those shows with the knights and stuff.
Don't forget to do the chicken-skin on the face "Hello Clarisse" ala Cable Guy.
Her reaction to that should tell you if she's a keeper or not.
Either she runs away terrified and you tell her it was a joke, apoligize, make up, get back together, have a long and happy life. Or she laughs. (in which case you duck out the side exit, because something is so wrong with that)