You shouldn't turn down someone offering you a generous tip.
Adam is a waiter at a high-end steakhouse, and a new customer just offered him a big tip.
Adam wants to say something to the customer.
Adam accepts the tip, and lets the customer know how grateful he is.
Adam rejects the tip, telling the customer that they should donate the money.
The customer feels happy that they made Adam's day, and Adam feels motivated to work harder.
The customer doesn't donate the money, and Adam continues to struggle as a waiter.