They're all different and find excitement and enjoyment in different things. YB is so casual about dropping things (or chucking them over his shoulder) that I find it funny.

We've finally stopped playing Picking Things Up when they're dropped deliberately or swept off the tray. It was, however, a fab game for a while. Because at that point it was learning that things fall and disappear. Now it's his way of getting rid of stuff he's bored with.