Ordering Foccacias

The local shop where I buy my lunch is great - too great actually!  Between the hours of 12:00pm and 1:30pm the popularity of the shop rises to the point where you, generally have an extended wait between ordering and receiving your food.

Today I spent a goodly amount of time explaining the semantic differences of queues and stacks to one particular patron who didn't quite understand that the Rank of a queued item is a ReadOnly property... <Sigh />