Kung Fu, TKD, and Karate never really sparked my interest, but this pic is still funny (from tvtropes.org):
"Never act incautiously when confronted by a little bald wrinkly smiling man!"
— Rule One, according to Lu-Tze, from Terry Pratchett's Discworld
— Rule One, according to Lu-Tze, from Terry Pratchett's Discworld
"Age and treachery will triumph over youth and skill."
— Fencer's Adage
— Fencer's Adage