A day without laughter is a day wasted
You cannot be mad at somebody who makes you laugh - it's as simple as that.
"If we may believe our logicians, man is distinguished from all other creatures by the faculty of laughter."
"Laughter is an instant vacation!"
"We must laugh at man, to avoid crying for him."
"Laughter is the shortest distance between two people."
Laughter is America's most important export
"If you take life too seriously, it ceases to be funny"