You unscrew the stem, blast them in the face with hot baccy and then stab them in the eye with the stinger.
In 1931, after three years of research, the new Drinkless Kaywoodies with the synchro-stem, (threaded drinkless screw-in mouthpiece) were introduced. The drinkless attachment was advertised as cooling the smoke from 850 degrees in the bowl to 82 degrees when it entered the mouth.