Since not everyone knows when they've had enough, chances are that sometime during your college career, you'll encounter a person whose drinking on a given night has gotten dangerously out of control. Even if, in some cases, you worry that the person may get in trouble, how can the person be angry with you for trying to save his or her life. If you notice someone exhibiting any of the following symptoms, you must intervene. Here's how:

Here's what to do when the person:

is having difficulty breathing: If the person is not breathing normally or if he or she stops breathing, head to the emergency room immediately.

is vomiting: Try to keep the person sitting up. If they insist on lying down make sure they do so in a fetal position. Keep an eye on them to guard against choking.

has passed out: Try to wake the person up. If you can't, put the person in a fetal position and call 911 or your college emergency service.

is injured: Take the person to the emergency room. He or she may not feel pain and tell you they do not require medical assistance. Do not believe it; insist that he or she see a doctor.

has a fever or the chills, or skin that is cold, pale, bluish in color or sweaty: Call a doctor, describe these symptoms, and get advice on what to do.

is exhibiting threatening behavior that may endanger others: Notify the party's host or a bouncer at the bar. Call the police if the behavior is especially volatile.

seems to be paranoid, confused, or disoriented, or has difficulty standing or speaking. Take the person home and make sure he or she does not drink any more alcohol. Try to keep the person awake and calm. If symptoms persist, call a doctor.