Hospitality - Saudi Arabia
The big thing in KSA: if you find a door open, you can enter, have a seat and drink coffee, dattes, tea...There is always someone, most of the time indian to welcome you.
Of course, i do not think this hospitaliy rule works in big towns, but in the little villages, i drunk liters of tea, coffe and kg of dates!
Same on markets, where people will offer you coffee in a natural way.
I think it's also because there are no tourist yet in KSA!