Here's the situation, I've been invited to talk to a group of techies on PD for half an hour this friday (the 3rd), there's basically two options. Either I do a basic introduction to Pd, it's benefits and why I like it as a medium/language. Or the one I'm leaning towards now, A quickly thrown together example of something you can do in PD. 

I'm currently thinking that I could easily put together a plan to code a simple instrument from a USB controller within half an hour. Thus showing that a lot can be achieved in a relatively short space of time with some Pd knowledge. 

Has anyone got any ideas how I might try to impress people with the capabilities of PD? 

Cheers

Andrew