Modern Warfare 2 sniper/hiding spots

Do you need to organize an ambush? Or maybe call in that chopper gunner but have nowhere to go? Perhaps you need an amazing glitch which plays with your mind?

Here are the spots:

Carnival: In FUNHAUS there is a fortune teller kill him then go behind his stand!

In afghan: there is a sam site at "C". Head down the stairs there and at the corner there is a concrete block go behind it!

Also in afghan: there is a walkway and a room there, on the side with the explosive barrel there are stairs, lay down with your back to the room and it's like your out of the map!