To play, or not to play - make up your mind

son: Daddy can you come outside and play fwisbee (frisbee) with me?
me: Yes, just a minute.
<repeat 20x>

We go outside with the frisbees.

son: Wait daddy
<runs off to play with something else>

me: I thought you wanted to play frisbee?
son: Oh, ok

I throw the frisbee at him but he's too busy looking at the other 4 things he wants to play with and just lets the frisbee hit him in the head.
<repeat 4 times>

me: Ok, if you're not going to play frisbee I'm going inside.
son: NOOO!! I wanna play fwisbee <starts crying>
me: Fine, we can play but you have to play too.
son: Ok

I throw the frisbee at him but he runs off to go hang on the tree.