I was buying a pint and I did not know how much it was going to cost. However, I had a pocket full of change which I knew the exact value of. The pint came to exactly that amount, so, successfully hiding my glee, in one seamless move I raeched into my pocket, sorted the change by coin demonination while my hand was in mid-flight, and placed it in the hand of the bar person. Then I picked up my pint, turned a slow 360 degress whilst taking the first sip and smoothly walked towards my table without looking back. Smooth!