It works in the movies

In the movie, Working Girl, Tess (played by Melanie Griffith) makes her pitch to the head honcho of the company. She has to convince him of her talent or else she'll be kicked to the curb.

And, of course, I'm telling you this because Tess does this in the elevator. This is her do-or-die pitch, and you can take a look at it via this link.

It's not the kind of elevator speech that you might ever have to give, but what you can key into is this: in 30 seconds or less, you walk away knowing her confidence, assuredness, knowledge, preparedness, and passion. And, she's told her what's in it for you.