If your eye pops out, there is something you can do.

http://www.slate.com/id/2137959/

In which the Explainer explains how to get your eye back into your head if necessary. Warning: don't read this if stuff like this sicks you out. In fact, no one should read this, ever. It reminds me of the time that happened on ER, and Abby wedged the dude's eyeball back under the lid. So gross. I'm going to keep my eyes 3/4 closed from now on to prevent this.