Where did the yogurt go?

Will woke up from his nap the same way he always does: Hungry. Dinner wasn't going to be ready for another hour so I gave him a snack, which was yogurt. I dished him a bowl and put it on the table for him, leaving the container of yogurt on the counter.

Will went outside with Alex to fix the brakes on the car. I heard Will come back in to finish his bowl of yogurt, so I thought. Alex came in a little while after him and called up to me, "did you want him eating this yogurt?" I said "yes" thinking it was just his bowl.

I went downstairs a while later to finish dinner. When I went to throw something away in the garbage can, I noticed the entire container of yogurt (including the spoon) was in there. I took it out and noticed it was all gone. When I gave Will yogurt for his snack it was 3/4 full. Will had finished his bowl plus the container of yogurt! Needless to say, he didn't eat that much at dinner.