Prom Ideas.. Creative ways to ask her..?

I am in need of an extremely creative idea to ask my girlfriend of nine months to prom. She stole my original idea when she asked me to the Sadie Hawkins dance, she sent me on a scavenger hunt to all the places that we had dates on and where we had our firsts. I was planning something like that, but I want something original and something that will make her feel extremely special.... Please throw out some awesome ideas!