Unlikely favorite....

Jack's current favorite toy is....

a ladle.  that's right, a ladle. 
I was fixing dinner one night and pulled out a few things for him to play with.
It was love at first play. 
He loves the way it sounds when he bangs it on things.
He puts it in his mouth and crawls around like a dog.
If you don't know where he is, listen for the hollow bang of a ladle on tile floor...
and there you will find him.