“You may laugh of the idea of the good will of others in Hollywood, but it's no laughing matter if you don't have it.”
How To Get Along In Hollywood (1948)
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Irene Dunne 50
American actress 1898–1990Related quotes

“You don't stop laughing when you grow old, you grow old when you stop laughing.”
Variant: We don't stop playing because we grow old; we grow old because we stop playing.

The Boys; reported in Bartlett's Familiar Quotations, 10th ed. (1919).

Preface
The Daring Young Man on the Flying Trapeze (1934)
Context: The most solid advice for a writer is this, I think: Try to learn to breathe deeply, really to taste food when you eat, and when you sleep really to sleep. Try as much as possible to be wholly alive with all your might, and when you laugh, laugh like hell. And when you get angry, get good and angry. Try to be alive. You will be dead soon enough.

Press conference at the 2016 Australian Open after semi-final loss to Novak Djokovic, after reporter's suggestion that the victor's dominance may be greater than any other in history due to 'there being no great opponents in the future.' http://www.dailymail.co.uk/news/article-3420985/Cranky-Roger-Federer-loses-reporter-asks-quality-current-players-crushing-defeat-hands-Novak-Djokovic-Australian-Open-semi-final.html

“What are you laughing at? You are laughing at yourselves!”
Act V, sc. viii
The Inspector General (1836)