An interesting thought just occurred to me. I was thinking about the VCU regional, all those microcontrollers with radio links sitting around, and the (obvious?) issue came to mind. Would it be possible for a program to replicate via radio link, perhaps through some clever buffer overflow? I'm guessing the answer is no, but it's worth looking in to because:
1) It's technically interesting
2) You'd want to patch that before someone else has a similar thought
NOTE: Yes, I know this would be horrible, I don't advocate this kind of thing. Yada, Yada, Yada...