Interesting story --
Back in the early 1980s, my friend had his first job out of college, as a salesperson for a small computer company. He was scheduled to go on his first business trip to meet a client, and the company fronted him $500 cash for incidentals.
So, he stays at a nice hotel, wines and dines the client, takes him to a baseball game, etc. And he still has $200 left over when he comes back to the office. What to do? Since he did not need to supply receipts for that fronted money, he decides to pocket half and turn back $100. He goes to the accounting office and gives back the $100.
The accounting person says, 'What's this?' He says, "This is what is left over from the cash you fronted me for expenses." Accounting says, "Oh! I don't know what to do with it. No one ever brings money back."
My friend says he went back to his office and banged his head on his desk and muttered, "Stupid, stupid, stupid . . . "