I went to a Starbucks cafe and I told them it was my birthday but that I didn't have a coupon. They were a bit skeptical but gave me a free coffee of my choice. They didn't want to look at my Driver's Licence and I didn't even have to show them my Starbucks card.
Later that day, I got greedy and went to another Starbucks for another free coffee. Again, no coupon and no one really looked at my ID and no one scanned my Starbucks card. I could probably have had as many coffees and Frappachinos as I wanted that day because the employees didn't seem to really care.