I think it was in the 20s for Perfect Dark Zero. Me and my older brother were playing together on the Facility map against bots (and no, they weren't meat sims or peace/coward/etc sims since the only kind of bot you can have in Zero is a combat one). I was in a hallway and they just kept coming after me. I kept gunning them down with my duel Falcons, and the announcer (or whatever you want to call him) was just going nuts. You know the guy that does the announcements for Halo multiplayer, and when you get a certain number of kills he'll say 'killing spree', Kilimanjaro', and stuff like that? Well, the Zero announcer is sort of like that, but the higher your killstreak, the louder and more excited he gets, not to mention how ridiculous what he says is. Everyone was laughing since he was pretty much yelling gibberish such as "KILLAMAGIBLAGOOO!!!" or something along the lines of that.