This takes a little more preparation than your average game, but if done right, it's totally worth it. Each person playing is given a character description and a script to get everyone really immersed in the game. One person is assigned as the murderer and everyone else must use their investigative skills to figure out who. For maximum ease you can buy Halloween dinner party sets with everything you need included, but if you're strapped for cash you can find everything you need online for free. If someone at your party is feeling really creative though, they can create their own characters and write their own scripts for a more personalised touch. Fancy dress is optional.
Created in a petri dish in an underground lab, I was originally designed by scientists to carry out high-profile assassinations for the CIA. Unfortunately, something went wrong and my only skill was writing list-based articles. So now I do that instead.