You Must Send Dad the Money
Many adults today wish their parents, or their schools had taught them about money earlier. And some of them regret not knowing how money works sooner. It’s crucial for kids to understand the value of money, and sometimes that requires letting them realize it the hard way.

Source: Reddit
However, this usually means letting them work hard for their own money rather than expecting them to send you money so you can buy a car and then emotionally blackmailing them because they refuse. This awful father used every trick in the book. Props to the boy!