A friend was getting into his car and I said to him: "Be careful driving."
"I don't plan to get into an accident," he replied.
Does anyone plan to get into an accident? Of course not. Everyone starts out their journey thinking that it will be an ordinary drive, even though we all know that crashes happen. In fact, according to the NTSB, accidents happen every minute of every day.
While you can never prepare for an accident or its aftermath, you can take steps to document processes and cross train during the good times. Art Roche prepared what he terms a "Bus Book" -- how to do his job (and another version of how to manage things at home) -- should he be hit by the proverbial bus.
There is a distinction between being prudent and being morbid. Think about what key things your organization would need to know in your absence and make sure that you have record of them where someone else can find them. Santa isn't the only one who should be making lists!