dude.. putting the clutch in and taking out again to make the car jump? wtf! that doesnt do crap!!

double clutching is something that truckers use because they dont have syncros. i dunno hwo to explain it. but thats how its done-- ive read it somewhere. i know its on g2ic.com, like in the tips section or whatever.

but as letting the car jump and stuff? that makes you look like an idiot who cant drive a stick, and it doesnt give you a boost or anything. just shift like normal.

putting in the clutch and blipping the throttle is called burning your clutch.
putting in your clutch and blipping the throttle while down shifting is called rev matching, people do this so the downshifts are smoother, and its easier on your transmission.