Video Game Reference: "I used to want to continue living, but then I took an arrow to the knee"
Joke: "Hmm.. I think I'll haunt you. Eat all your cereal, randomly turn on your tv to watch My Little Pony or maybe some documentaries because you need to learn some stuff about something... Peek on you in the shower... I didn't say that last one out loud, did I?"
Seriously: "I love you all, and don't regret a thing. So smile."
(Maybe mine is a bit cheesy, but I think that would be a nice note to go out on.)