I'm surprised none of the other oldies here have jumped in with the story of Hoot Gibson, the only guy ever to do a Mach 1 slow roll in a 727. Seems there was a theory floating around Eastern AL(I think) that a 727 was just a tad faster in cruise with a couple of degrees of flaps out. Trouble is, any flap deployment on the 7 2 also put the LEDs (slats) out. Answer was to pull the LED circuit breaker before bumping thr flaps out 3-5 degrees. One day over middle America, Hoot decided to try it while the FE was in the lav. Upon returning to his sideways seat, the observant 2 striper noticed the offending circuit breaker out, and to be helpful, thumbed it back in. Imagine the result. Slats come out at about triple the max VFE. (There's a reason there ain't no MFE.) One slat quits flying formation with the rest of the aluminum causing a right smart bit of asymmetrical lift. Airplane rolls inverted, nose drops a lot, and soon our intrepid test pilot breaks Mach 1 in an uncontrollable roll. Since there aint no, "Oh
a slat tore off" checklist, Hoot improvises and dumps the gear to slow down while yelling at the FO to help him pull out of the dive. The FO couldn't hear him, probably because he was screaming too loudly and due to the sounds of rending metal as gear doors and other stuff joined the slat in freefall
It did slow down, but not until bending the airframe beyond repair and putting more dihedral in the wings than Cubcrafters ever imagined. Our quick thinking hero was rewarded by the airline with a vacation. The FAA
response was to mandate the installation of overspeed horns, which until recently went, "HOOT, HOOT, PULL UP!" rather than "WHOOP WHOOP, PULL UP!"