That’s probably because they knew you preferred stout.
The boss of a place I used to buy doses etc off came out to collect money off me one time. Neither of us knew the exact amount owed so gave him 150, which was about 30 more than I owed. About 12 months later I went into the shop to buy boluses and there was no record of the 30 quid they owed me. I had some job to persuade the cu@t behind the counter that I was owed 30 euro. He didn’t even own the business. I’ve been all my doses and boluses online since.