Who said "Eustace is such a grouch."?

This quote is attributed to Courage the Cowardly Dog.

Eustace is such a grouch. - Courage the Cowardly Dog

"Eustace is such a grouch."

Courage the Cowardly Dog Humor

"Courage, the cowardly dog."

"What's wrong, Muriel?"

"Oh, the things I do for love."

"Stupid Eustace!"

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."