In the video of Boeing's F-15 demo for South Korea, they have the demo pilot's in-cockpit audio dubbed in. He says "100 knots, rotate" on the video, then lifts off immediately!
Reminds me of what I was told as a young student of aerodynamics:
"But once your thrust ratio gets much above 1:1, the rules change."
(This was in regard to high-Alpha maneuvers, but nonetheless I thought it fitting.)