“There is nothing in the world so irresistibly contagious as laughter and good humor.”
“There is nothing in the world so irresistibly contagious as laughter and good-humour.”
“It is a fair, even-handed, noble adjustment of things, that while there is infection in disease and sorrow, there is nothing in the world so irresistibly contagious as laughter and good humour.”
“There's nothing more contagious than the laughter of young children; it doesn't even have to matter what they're laughing about.”
“Laughter is contagious and I'm trying to start an epidemic.”
“Good humor and laughter are far too wonderful not to come straight from the heart of God.”