What would you script first?

Maps can run their own code now. Waves, scoring, custom damage and whole arcade games are all possible from a script.

I'm curious what people would build first, because that tells me which parts need examples and which are missing altogether. A tower defence with proper scoring, a hero arena, or something that isn't an RTS at all.

What would you make, and what's the first thing you'd need that you can't find in the docs?