Good song for talent show? (broadway or pop?)?

So my friend and I want to perform at our summer camp's talent show, but we don't know what to do. We could go a couple different ways...we're both performers (musical theatre, etc.) so we could do a Broadway duet, or we could do a solo pop/rock/alternative song that we could harmonize and I could play piano chords on. We both have considerable ranges, but we don't want it to be too serious or heavy - light and possibly humorous would be preferable. Open to any appropriate song options *except* country and Justin Bieber. Thanks!!!!