As part of my scifi setting getting ready to emerge on the forum in certain roleplays, how about a good excuse to fight each other by way of a hyper realistic virtual reality program? It can be used as a combat simulator to train people or some can even use it just for fun without worrying about dying for real. You guys wouldn't need to know much about the setting and could even just use normal humans with scifi  guns you'd expect to see in something like Star Wars.