He spent the first half of the morning sitting at the cafeteria tables with his friends' Granny, the two of them quietly reading while the rest of us jumped. Eventually he decided to have a try and was hooked the moment his socks touched the colourful vinyl squishyness.
She started chanting "Castle! Castle! Castle!" as soon as we neared the entrance and jumped, rolled, pranced, slid and explored excitedly for the entire 2-hour session.
Oh my goodness, it was so much fun!