Welcome to Sonic; may I take your order?
Yeah, can I get a Route 44 Strawberry Limeade?
That'll be $2.15.
I consider swiping my credit card right there at the ordering kiosk but decide to pay cash instead. After a few minutes a young carhop walks up to my window.
Here's your limeade. Would you like your credit card receipt?
I didn't use a credit card.
Oh.... (She looks at the receipt in confusion.) The total was $6.57, right?
"$6.57?! Are limeades now petroleum-based?" I refrain from asking.
No, I just got the drink. It was $2.15. (I hand her $5 and some change and decide to be helpful.) I'll just need $3 back.
She hands me the $3 and I wonder how much I could have gotten away with asking her for. Maybe I could've made money on this deal....