I Pity The Fool
I Pity The Fool is a catch phrase popularised by former WWF wrestler Mr. T, who first used the phrase during the movie Rocky III in which he plays boxer James Clubber Lang. The catch phrase was repeated by Mister T in his role as B A Baracus in The A Team and in various children's shows (including shows titled "Mr T" and "I Pity The Fool").
The phrase is essentially meant to mean "Don't mess with me", suggesting that anyone who messes with him (Mr. T) was a fool (and was going to get clobbered).
The phrase has been repeated in many other media, although it is almost universally recognised that it originates with Mr. T.