What do YOU do?

Poll - Total Votes: 10

Charge $15 for the written $3 tip?

Charge the written $16 resulting in a $4 tip?

Charge the written $16 resulting in a $4 tip and donate $1 to the cash drawer?

You can only vote on one answer.

You're a server, bartender, whatever position where tips are a valuable thing to you. The customer's bill comes to $12 and they tip $3.

But what's this? They wrote the total as $16. They've already left before you could ask them to correct their mistake. So what do you do?