quality posts: 105
We have also used it in a casual restaurant for the same reason (shame on us for bringing out the phones during dinner?!).
Related to this - a fair number of people I know have started a game of putting their phones on the table during a meal. First one to pick up their phone buys.
It is shockingly effective.
With relation to QR codes, I prefer if they lead to practical information - I can always find a facebook page or other social media, I like my info practical.
I'm just hanging out, really.