I feel like 400 million dollars (or 327 million euros or so in my case) would be a bit of an overkill, but here's a few things I'd do in case I suddenly won a lot of money:
- Pay off my student loans, FINALLY
- Get a nice apartment or a small house
- Buy a ridiculously cool climbing tree for my cats
- Help out friends and family (like pay off the student loans of my siblings etc.)
- Donate money to animal shelters and possibly start my own retirement home for old homeless cats
- Support artists I like
- Maybe travel and try things I've never done
- Invest in renewable energy sources, like solar panels
That's about it. Luckily I don't need to win the lottery to get at least some of these in the future. I'm especially looking forward to getting a big climbing tree for my cats. Their current one is rubbish.