What would you tell people instead of "I won the lottery"?

You win the lottery, and it's a stupid amount of money, but you don't want people to know for obvious reasons.

What would you tell them is your source of income when they notice you're not working a regular job, but are still living relatively well?

You're not spending extravagantly to help keep your secret, but you're still going out and keeping up with your bills. What story would you come up with to explain your work free lifestyle? How much do you think would be enough to explain it, but not enough to attract mooches? Perhaps a side hustle that you could say was doing well.

Would you feel obligated to come up with a story, even for your close friends and family?