The $97 Paradox

I went to buy dinner earlier with 50 bucks in my hand.

I went to the zhi char stall, ordered fried rice and hor fun. Bro wanted wanton mee, so i wandered to the wanton mee stall to order one. I held out my 50 dollars note and the auntie gave me change.

I used the change to pay for the fried rice and the hor fun. When i reached home and put the plastic bags down...

Guess what happens next?

If you've read carefully, you'd notice it.

"I held out my 50 dollars note and the auntie gave me change. "

The auntie didnt actually TAKE the 50 dollars note. and i didnt realise i didnt give her the note because the plastic bags and the 50 dollar note was in the same hand.

so essentially, the auntie paid me $47 dollars to buy her wanton mee.

Can you say "windfall"?