The bathroom door at work was not locked and I walked into the single stall to find another female adult in there. She said "ah!" and I said "so sorry!" I quickly shut the door and stood outside of it as I didn't want anyone else to accidentally walk in.
She came out and said something light hearted.
My response as we parted ways: Well, nice to see you!
OMG... I was dying. Why did those words have to be the first thing I said?! Could have said "have a nice day" or "have a good one."