Moon on Thursday January 8, 2015

I was driving north on Route 539 from Whiting, NJ  7 a.m.  when I noticed a strange looking Moon.  In the upper right side there was what appeared to be a "slice" in the Moon.   What in the world?  I looked and looked, could not believe my eyes.  No clouds as it was absolutely clear.  I rolled down my window, no change.  Took off my glasses, no change.  What?   About 15 minutes down the road I noticed that the Moon was back to normal.  But what caused the appearance of the "knife-like slice"  on the Moon?   Did anyone else see this unusual  appearance?  Maybe I need to see a "astro-psychologist" !