My friend told me that the witch cries because she is half zombie and half human.she's sad that she isn't human.
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It depends on what map you play, most maps have somewhat the same number of them, except for Hard Rain-sugar mill, which has a higher number of witches because they are attracted to sugar.
A witch is a boss-like enemy in Left 4 Dead. It sounds like a small girl crying and screeching. If you get too close to it or shine your light on it for too long it will freak and take down the person who spooked her. You can sneak around some of them though.
the campaigns for left 4 dead are: NO MERCY BLOOD HARVEST DEAD AIR DEATH TOLL
There are a few sites, check out the Left 4 Dead forums online.
4 players can play in Left 4 Dead 2.