When you don't know a picture has been taken of you until you see it uploaded by someone else on facebook. Usually results in an embarassing picture getting into the public's viewership, or it can be a normal, innocent picture.
I got wasted and started getting rowdy with this hogbeast
, but I didn't think anyone saw and I got away with it. Unfortunately I got a facebook surprise when I saw jen uploaded pics from that party and it had some ebarassing photos