Huh? There's only two types of chasers, Hexagons and Masks. Hexagons are only lunatic in certain places, if you use the Megaphone near them, or if you hit them with the Wrench. Masks are always lunatic except with the TV effect (it must be turned on), or under certain circumstances I won't reveal. There's also the weird metal balls from the Portal world, but they don't really chase you.