Once, and if anyone's had an abrupter end to a blind date than mine, please do share.
I was visiting some long distance friends, and they arranged a date for me with a girl from their social circle who I wasn't acquainted with.
The date was at a cafe/coffee shop in a library. We met outside, exchanged a few pleasantries, and I opened the door for her to make her way inside. She walked through the doorway without acknowledging the gesture. As I was still holding the door open, an elderly couple were making their exit, so I did the right thing and waited for them to leave before letting go of the door. They thanked me on exit, while my date had gone ahead and made a beeline for the cafe without me, totally oblivious.
I knew there and then the blind date was over, because my date was figuratively blind! Without saying a word, I took my leave, turned off my phone, and returned to the suite I was staying at.
Moral of the story, chivalry ain't dead, and don't date anyone like me if the art of noticing isn't one of your strong suits.