Remember when Elle Fanning flew her prom date to Cannes because her senior prom fell at the same time her movie was premiering at the festival? Well, she talked to BBC Radio 1 and shared a cute story of how she totally ruined her promposal.

It wasn't her first time to attend a prom, but she shares one of the biggest promposals she received—and totally flubbed. The guy called her to say he got into an accident and asked her to come to his car to get a First Aid kit in his car's trunk. Elle continues with story, stressing that she was totally serious about the whole thing. Watch the video below to see how it all plays out. She also talks about her impromptu prom night at Cannes.

Got silly prom Oops moments to share, too? What was the funniest or most embarrassing thing that happened to you?