The marshmallow test.

Oh, The Temptation by Steve V

I was never a fan of marshmallow, and never knew it was this irresistible to kids! Now watch what happens when you put a marshmallow + a kid in the same room and tell them to wait for you to be back.  It's kind of mean but this is just so funny, I can't stop laughing.

Seriously If you do have a kid about their age, this might be an test you want to put them to.