I think not showing the nice thing that was done by the shark adds to the mystery and intrigue of these comics. It's a tactic in making people want more. Obviously it works because I get so many comments that I delete all but 5 of them.
I'm a big fan of Foster's home for Imaginary friends - especially the episodes with Cheese. He cracks me up and I thought "what a perfect guest star he would make!". The day after I finished this sketch, I found this video and it was such an awesome coincidence! Water horsey!
I have no idea how or where the human disappeared off to in the last panel. Maybe she's imaginary.