Microsoft dining services installed a self-service store in our building. After you complete your transaction, the kiosk reminds you to consider the environment and asks if you want a receipt.
If you say, "No receipt", it spits out a blank piece of paper.
So I guess technically you didn't get a receipt.
(The problem has since been fixed.)
Bonus chatter: One of my friends has an ATM at her workplace that reminds you to consider the environment and asks you if you want a receipt. If you say "Yes", it tells you that the ATM doesn't print receipts.