I'm sure it's been mentioned before but fast food restaurants that give you different order numbers...
You place an order at their kiosk and you get the message: "Thank you, your order number is '47'".
The same kiosk prints a ticket out with the order number as '5147'.
The store screen displays your order number as '147' and when your food is ready, the employee calls out "147" and provides your meal with a printed ticket attached, number '147'.
Choose a number!