I had the unpleasant experience of watching a M.A.T.S. C-133A stall and crash a couple of hundred feet in front of me
I believe the C-133 was the recepient of a large number of vortex generators installed spanwise on the upper wing surface during the original development program, in an attempt to correct handling issues in the stall. These VG's became perfect ice catchers, of course, which became the presumed cause of several losses, if I am not mistaken.