Typing Of The Dead: Overkill is absolutely brilliant. Yes, it's just a lightgun game that swaps the lightgun for typing words on a keyboard. Yes, it's crass. Yes, it's rude. Yes, a thousand times yes, but that's why we love it Better yet, you can get it for under £4 at Green Man Gaming with their YOGCST-BESTYT-EVERRR voucher code, saving you a tenner. The DLC is cheap as chips too, and hilarious.
Thanks and credit to bandwidthbob @ HUKD!