Ask her what she is doing here.

"What were you doing that brought you here dressed like that?"

"Going to a costume party of course." She titters laughing playfully at you, "But my car broke down just up the street and your light was on. The costume contest has a prize of $1000, and I am going to win."

"Wow $1000 where is it?"

"At a club downtown. You want to come? You would just need a costume."

"Sure, but I have no idea where to get a costume in under an hour."

"I do, you wanna drive there? I can lead the way."

You think about it for a second and reply. "Sure why the fuck not." She skipps out to your car and climbs in, you follow her directions and are there in no time. However as you pull up you see the owner closing up and locking the door. "Hey wait I need a costume for a party, please you have to help me, I can't upset my date." You point back at her and add. "I mean look at her, don't make me piss her off."

"Fine but I only have one costume left that I know will fit you. You want it, it will be $100."

"Ok fine give it to me." Taking the costume you race back to your house to change.