Stage Crush - Noun.
When seeing a theatre show, you cultivate a sense of adoration and attraction to a particular member of the cast, and can't stop thinking about them the entire time.
Stage crushes are usually dealt with once you see them offstage being mean to their friends and ignoring people they don't like, all the while making bad sexual puns.
I was watching the boy who played Roger all evening - his guitar playing was so sexy! I got a completely ridiculous stage crush. I just had to go meet him after the show! But then I saw him offstage covered in grease and sleazy smiles... and decided to hightail it outta there.