Once went to a pub which was all 'stock market themed' and the prices went up and down second by second. Time things well and you could get a pint for a dollar

Once went to a pub which was all 'stock market themed' and the prices went up and down second by second. Time things well and you could get a pint for a dollar, but order after 10 other people ordered the same thing and you might pay $20. The price was set at the moment the staff member keyed it into the till, which was obviously a minute or so after you ordered it and the drink was poured, which leads to you often choosing what appears best value at the time, and then paying more.