Magic Mushroom

Ray's Daddy was out of town most of last week so he wasn't around to see all the great loot Ray hauled in but recently we had a conversation that went like this:

K:  "What's this?"
Me:  "Ray's new magic mushroom."
K:  "What does it do?"
Me:  "It dispenses food and treats so Ray's brain can be stimulated."
K:  (Turning it over and around in his hands) "How does it work?"
Me:  "Ray must be smarter than you because he figured it out right away."

What are your favorite food and treat dispensers?