This guy at :20 in... Good example.
If the rears have already lost traction and you've got the engine wound up, when you lift completely off, the compression braking causes more or less the same effect as if you pulled the emergency brake on full-tilt - couple that with pitching all the weight onto the front wheels and a little counter-steering and bam, you just overcorrected into a curb (or tree, or a parked car...).
