We are planning to go to the Pacific Aviation Museum next week. They already provided us with the hint to book the tickets online to prevent standing in a long queue. Before booking the tickets I wanted to know if I had to print something. So I just wrote on their wall on Facebook. Less than an hour later they helped us. A PDF on the phone will do it:
Thank you very much for helping us so fast and in so an easy way! No phone call (you know: Roaming is expensive), no form on a web page. Just a question that you answered :-)