Let us all just learn some things, OK?
1. Always check the killer items prior to taking the runway for takeoff...flaps/slats, trim, flight controls free and correct and all the stuff we wrote about months ago.
2. On any plane, you need to know certain symptoms. If something isn't right, maybe the plane thinks its in the air. I wonder where the landing gear over ride button was during taxi out.
3. if you aren't flying well on takeoff and all engines are working, and you might be stalling...put down some flaps/slats.
P51 guy is on the right track, whether it is a relay or not...but always check things, just like a doctor with a patient.
I love the DC9 series. I've seen the RAT/EPR gauge show the wrong readings at the gate and lo and behold, the plane thought it was in the sky for whatever reason.
Be careful...it is what you are paid to do.