This doesn't seem so hard to imagine. I recall from personal experience that when doing an ICAO B Noise Abatement departure that any premature restraction of the flaps would almost immediately cause the stall warning to activate. The PM had to pay attention to the flap retraction schedule before moving the flap handle to the next retracted position, and if by chnce he went through the gate to the next flap setting you could expect that shaker to activate almost immediately. Moving the flap lever to the correct position would correct the problem along with lowering the nose at the same time. Attention getter for sure!