Paradox
Paradox is accrued when a Mage uses vulgar magic that cannot be explained by Sleeper's idea of what Reality is and what laws govern it. Effects such as crushing a car with your bare hands are vulgar and will gain you paradox.
However, it is possible to bypass paradox through the use of coincidental magic by aligning the Effect with the rules of consensual reality (the overall beliefs of the sleepers). The same effect of destroying the car could be coincidentally performed by manipulating a street light to fall on the car. If the offending mage has acquired a significant amount (6 or more points) of Paradox, they may experience what is known as Backlash.
Backlash can occur in one of four ways; Either the mage acquires direct damage (amount and type depends on the amount of Paradox accrued), the mage becomes the target of a malicious Paradox Spirit, the mage may acquire Paradox Flaws, or the mage and those nearby can be sucked into a Paradox Realm in the same vein as the magic in question. (Correspondence could create a spatial loop, Time could create the repetition of certain hours or days.) Some certain objective would have to be achieved in order to escape from the infinite loop.