For goodness' sake, he didn't have some kind of eidetic memory.

"Out the window. Just hold on, and don't get yourself in a tizzy about the heights or anything; you're not going to fall if you're with me. Let's get going to some previous Christmases so we can get about fixing you."

Arthur waited a moment for the scenery to change a little to illustrate the flashback, with sound effects of kiddie randomness in the background. "Recognize this?"