All Jokin' Aside

So, the other day Jack said he had a joke for me. I couldn't wait to hear what would come out of his mouth. So, here goes.

Jack: "What did the cow say to the pig?"
Me: "I don't know."
Jack: "Oink, oink."

Get it? It's been more than 48 hours and I still don't get it. Yesterday, Jack insisted that I tell him some jokes on our way home. So, here goes...

Me: "What did the lightbulb say to the ghost?"
Jack: "What?"
Me: "You scared the living daylights out of me."

Me: "What did the one tree say to the other tree dressed in polka dots?"
Jack: : "What?"
Me: "Your bark is just a little too loud for me."

I'm ready for standup.