If it can happen it will
I called to my colleague, positive climb----gear up, and then i heard the wrong sound, flap lever moving. I reached over and he realised his error.Flaps had barely moved. A 737-400, flap 5 take off.The leading edges dont move 'til you go from 1 to up so no big deal but i told him the trident story later on.
As an aside , i once got the stall warning on rotation. leading edge sensor that talks to the stall warning computer was dickie, looked up and saw amber light on leading edge indication panel, (they'd been all green earlier, sop to check)