"St. Mark has been guarding" joke

St. Mark has been guarding the Pearly gates for a long time, and it's
well past time for St. Peter to relieve him, and St. Peter hasn't come
by, so finally Jesus takes pity on him and takes over. While He's there,
an old man comes up to the gates.
"Welcome to heaven" says Jesus, "tell me a bit about yourself."
"Well," says the old man, "when I was alive, I was a carpenter. I had a
son, and for a while he was a carpenter too, helping about the shop, but he
left home. Made quite a name for himself, for a while, but they killed him..."
Jesus stared searchingly at the old man.
"Father?" he asked.
The old man stared back. "Pinnochio?"