Just remembered where I heard that.
"Titanic"
Page 8
Int: First Class dining room
RUTH (Rose's Mother)
And where exactly do you live, Mr. Dawson?
Jack:
Well, right now my address is the RMS Titanic. After that, I'm on God's good humor.
Ruth:
You find that sort of rootless existence appealing, do you?
JACK
Well... it's a big world, and I want to see it all before I go. My father was always talkin' about goin' to see the ocean. He died in the town he was born in, and never did see it. You can't wait around, because you never know what hand you're going to get dealt next. See, my folks died in a fire when I was fifteen, and I've been on the road since. Somethin' like that teaches you to take life as it comes at you. To make each day count.