Sort of like some of them Nascar guys. Some use marbles, some use rocks I hear’d.
I never heard of this marblemouth. Interesting.
http://www.youtube.com/watch?v=Ybcu1Su4eeE
http://www.youtube.com/watch?v=3eQrnERMiiE&NR=1
Too funny! My son could give them all lessons!
Demosthenes Practising Oratory by Jean-Jules-Antoine Lecomte du Nouy (18421923). Demosthenes used to study in an underground room he constructed himself. He also used to talk with pebbles in his mouth and recited verses while running. To strengthen his voice, he spoke on the seashore over the roar of the waves.
-Wikipedia