I couldn’t think of a joke, but wrote a fable about another subtask.
A subtask walked up to his parent and said … “I’m leaving”
The parent said, but wait, let’s get you assigned to someone before you leave, I’m worried about you. She ran out of the parent’s room into the project where they both lived and shouted … “I said I’m leaving, don’t follow me” and left the project.
This was a sad day, little subtask was never to be seen by anyone again.
Moral of the story, don’t let your kids leave home without someone to look after them, they may be lost for ever.