Laughter.

"The most wasted of all days is one without laughter."

- E. E. Cummings

"A good, real, unrestrained, hearty laugh
is a sort of glorified internal massage, performed rapidly and automatically.
It manipulates and revitalizes corners and unexplored crannies
of the system that are unresponsive to most other exercise methods."

- Anonymous

"Laugh a lot, and when you're older,
all your wrinkles will be in the right places."

- Anonymous

"When you realize how perfect everything is
you will tilt your head back and laugh at the sky."

- Buddha

"We don't stop laughing because we grow old;
We grow old because we stop laughing."

- Michael Pritchard