Better not toss away a serving of topping to the side, because everyone knows that even if you get the order right, the customer will still magically know what you did.
The secret to not having to make half your hotel elevators to eliminate wait complaints is a bit like the real life solution. Put a couple next to each other and stagger breaks in the shaft every eight or so floors. It's not like real life where people would complain they have to change elevators four times to get to the top floor. Works best with the 10 capacity elevators since it bunches the guests up.