Persuading a Toddler

I find that my children are full of contradictions.  Malachi could sit for hours in front of the tv without moving a muscle, but he also jumps at the chance to go outside and play.  Izzy, on the other hand, can't sit still for more than a few minutes, and yet he never seems to want to go outside.  Malachi always wants him to come out and play with him, and I always want him to go out so I can have some peace.  Malachi and I will both try to convince him and the conversation will go something like this (as a side note, Izzy can talk a lot, but in the tradition of toddlers, his favorite word still seems to be "no"):

Me, "Izzy, don't you want to go outside?"
"No!"
Me, "Don't you want to go play hockey with Malachi?"
"No!"
Malachi, "Izzy, you want to come outside and see the airplane swing?"
"No!"
Me, "I bet Malachi would push you in the airplane swing if you went outside...."
"No!"
Malachi, "Izzy, do you want to go see the ship (a fort of sorts that Malachi built)?"
"No!"
Me, "You want to go out and ride your trike with Malachi?"
"No!"
Malachi is now tired of trying to persuade him nicely and tries threatening him with something like this, "Izzy!  If you don't go outside you're getting a spanking and you'll never see your blankie again and then you'll die!"
Izzy is not moved.  "No!"

In the end, I bribe him with a cookie.