If you make a mistake, there's not a "too late" to correct it... and that's what this couple proved to a very surprised pizza man. 

They tipped him only 33 cents when he delivered them a $22 order... but the next day they sent this note: 

There was a cupcake on the front of the card... The whole thing reads:

Okay well maybe I don't really have a cupcake for you... but how about that tip from last night? We would like to apologize for our impaired math skills and to THANK YOU for the work you do. We appreciate it immensely!