Quote from Chandler in The One Where Rachel Quits
Phoebe: How do you sleep at night? Joey: Well, I'm pretty tired from lugging the trees around. Hey, Phoebe, listen. You got this all wrong. Those trees were born to be Christmas trees. They're fulfilling their life purpose by making people happy. Phoebe: Really? Chandler: Yes! Yes, and the trees are happy too because for most of them, it's their only chance to see New York.