Who said "I'm a Grifter, a con man, a liar, a cheat, a thief, and an idiot."?

This quote is attributed to Barney Gumble.

I'm a Grifter, a con man, a liar, a cheat, a thief, and an i... - Barney Gumble

"I'm a Grifter, a con man, a liar, a cheat, a thief, and an idiot."

Barney Gumble Truth

"Woo-hoo!"

"To alcohol! The cause of, and solution to, all of life's problems."

"I'm gonna go back to the lab and study some... stuff."

"Barney's my name, drinking's my game."

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."