The 18% tip was already billed to the customer, so they ended up paying the automatic 18% tip (even though they crossed it out) in addition to a $6 cash tip the

The 18% tip was already billed to the customer, so they ended up paying the automatic 18% tip (even though they crossed it out) in addition to a $6 cash tip they left on the table. The receipt was for about $40, if I recall correctly.