Even though I was never particularly a fan of annotations, and I don't even miss them now that they're gone, one thing I am sorry about is that I never got around to experimenting with some kind of "interactive" video with it. Something kind of like the "Click-O-Rama" feature from those B. Happy Web Premiere Toons on Cartoon Network's old website, where the plot devices and the outcome would be determined based on what options you click on.
Trouble is, I never could think of what I would do with that. Like, I'm sure it'd probably have Steve doing something stupid, but what would it be, and what could the options be for the outcome of what he was doing?