Or, put another way, Carpe diem.
But, the following inscription is above the proscenium at the Odeon theater in Florence.
Chi vuol esser lieto sia di domani non c’ è’ certezza.

Loosely translated it means “He who wants happiness knows tomorrow is uncertain.” My Italian teacher told me today that this is a famous quote from Cosimo I.
It seems like a good thing to think about every time you go to the movies, or anytime, really.