I've run into bizarre situations where smartphones were required. Went to Royale in Boston, and it's bad enough I have to use an app to pay for tickets, but at least I knew that ahead of time and accepted it. But then they wanted me to install another app to use the coat check when I got inside. How would one anticipate the latter ahead of time? Complete lunacy.

Ultimately I declined to use the app and hid my coat under a chair lol and I will not return to the venue.