Currently Being ModeratedFeb 13, 2013 9:56 PM (in response to lburvant)
Which mouse are you using? It sounds like you pinch zoomed, which is one of the numerous gestures used on a trackpad or magic mouse. Just pinch in with your thumb and forefinger.
If you're not using either one of those Apple devices, then post here. We'll have to figure out what happened.