Recording Gameplay from my 360

i was at a friends house and he had some gameplay recorded from Halo 3, on his 360 and he recorded it right from the Xbox360..i was like woah. anywahy how do i do this? i dont want to use Dazzle either, thanks

Have a happy new Year! (and i know its the wrong section, hardeware hadent a CLUE of what i was talking about)