Perfect for your office fun are the new Nerf guns. Life has sure moved ahead. Head over to Target to get these or Amazon if you are too far away and there is an entire website nerfhaven dedicated to modding theses things.
Magstrike. I’ve never seen anything fire so fast in my life. $18 worth of fun. Main problem is that the clips are not sold separately, so if you fire for 3 seconds, then you are in trouble 🙂