I went to a restaurant where you needed to install a specific app TO GET IN THE QUEUE. Not to order, mind you, juste to get a notification when your turn approaches.

My SO wanted to go so I had to stand there, in a normal line in front of the place for 20+ min while hearing people complaining that the android version didn't even work! My SO was lucky that the apple store had it and we could get in.

It could have been an email. It could have been a paper you take when getting there. The worst for me was that the place was hip because it was decorated as a japanese fish market, so the paper ticket would have made so much sense. But no, the management just want to steal your data (I figure).