Sounds mad but I wouldn't feel comfortable winning millions. I'd get anxious over what I spend it on, I'd feel like I didn't deserve it and feel greedy, especially as if I didn't give most of it to charity executives, I mean charities!, I'd be frowned upon. I'd want to achieve something and have a normal(ish) life, but I could use the money to travel the world!
Well, everyone would react differently I think. In all honesty, I don't think I'd go nuts and spend loads, that's just not me. I'd probably buy a new laptop, a few PS3 games, go on a cruise, buy a couple of albums and go back to uni and do a degree in something random. No point in buying a fast car or a swimming pool or a big house really. I'd like to give some money to charity, but as you mention it may end up in the pockets of highly paid executives. I'd certainly give some of the charities I worked for though.

If Yellowstone erupts we're all ****ed.