Kid: "Mom, I had a scary dream. Can I come sleep with you and dad?"
Mom: "Sure, sweetie, sleep in the middle."
Kid: "Dad, can you get the remote out of my back?"
Dad: "That isn't the remote."
*Weird background music*
The Back Remote
Explanation
The humor comes from the implication that the 'remote' the kid is referring to is not a remote but probably the dad. The kid is likely in between the parents and mistaking some part of the dad's body for the tv remote.