Here's another entry in the 'funny sign' category. You'll see a lot of them in this list! This time, we have a mother coming home from some time away, and her family is waiting to greet her. During her time away, she's apparently been doing time for real.
We like to think that if someone really was coming home from prison, the information probably wouldn't be put on a board like this. We therefore think (or hope) it's a joke!