Caption Time: Steve Balmer at CES – MacTalk Forums.

A couple of the popular ones:

1. Developers.
2. Developers.
3. Developers.

1 never gonna give you up
2 Never gonna let you down
3 Never gonna run around and desert you
rpt
1 Never gonna make you cry
2 Never gonna say goodbye
3 Never gonna tell a lie and hurt you

1. I
2. Love
3. This Company

1. I like big butts and I can not lie
2. You other brothers can’t deny
3. That when a girl walks in with an itty bitty waist, and a round thing in your face, you get sprung

And my personal favourite:
Steve Ballmer discovers he has hands.