Well I wasn't gonna bring anyone to my year 12 formal, but then I got worried that they might be taking photos at the entrance, so I asked this girl (who was actually one of the hotter girls in the year who just happened to not be going with anyone) about 20 minutes before, and walked in with her arm in arm.
Then it turned out that they weren't taking photos at the door so I didn't speak to her for the rest of the night.