Quote from Ross in The One After the Superbowl (Part 1)
Ross: I can't find the monkey I donated last year. He's a Capuchin and answers to the name Marcel? Dean Lipson: I'm afraid I have some bad news. Marcel has passed on. Ross: Oh, my God. What happened? Dean Lipson: Well, he got sick, and then he got sicker. Ad then he got a little better. But then he died. Ross: I can't believe this! Dean Lipson: I'm sorry, Mr. Geller. But you know, there's an old saying: "Sometimes monkeys die." It's not a great saying but it certainly is fitting today.