Why was six afraid of seven?
It wasn't. Numbers are not sentient, thus unable to feel emotions, like fear.
A visibly exhausted and distressed man walks into a bar and orders a strong drink.
"Long day?" the bartender asks.
"No, all days are 24 hours long" the man replies, amazed at how uneducated the bartender is.
Why was the boy sad?
A frog was stapled to his face.