Do you remeber your dreams?
Or being a child?

When I was a kid I had this little plastic dinosaur, and its mouth was open, and it was JUST the right size for a small finger to go in; sadly the angle of the teeth mean that the finger never came back out again without some degree of pain.

I can't remember HOW many times I stuck my finger in that dinosaurs gob... something to do with being able to explore the smooth unseen inside of the plastic toy made it irrisistable.....