aka the "I want it!" "No, I don't want it!" phase!

My LO is starting to do this all the time lately. She will cry for something, then decide she hates it- throws it down, and then cries for it back. What the heck kid? The worst offender is her comforter on her bed. "Cover!!" I then proceed to cover her. Scream and kick "No cover! Dont want it!" I then take it off her. Rinse and repeat until I have just had enough and throw it in a different room.

What do you do when your toddler does this?