You may not have any effective remedies or recourse, unfortunately:1) Since it was your roommate, not the landlord, who did this, you almost certainly cannot terminate your lease and move out. As a general matter, only when the landlord has impaired habitability or vioated the lease in some significant way can you legally terminate your lease.2) In theory, if you roommate's negligence or carelessness injured you, you could sue him for your injuries or medical costs. However, given the cost of a lawsuit, it is very unlikely--unless you suffered some significant medical costs--that it would be worthwhile going to this step.The law does not provide a practical remedy for every wrong done to us, unfortunately.