When you have problems because of your stupidity, there are two choice : being frustrated or forget it then move on. Most people feel the first one, less people choose second. For example, you are accidently announced to be winner and get a prize. You 50-50 mean it is as fraud or real. So you go ahead then evidently its fraud. You calculated before if it is as fraud you will loss several money, if not you will get some money. Eventually you are really dupe. Because you have calculated the risk, even you are sad, you will not being frustrated.
The lesson is risk management is important for every decision you take.
Talking about fraud, being victim is one of way to understand the various motive that make you more carefull.
If you ever experience above, just move on. The world is not ended because of this.