I would buy:
buy every pinball machine ever made
buy every arcade machine ever made
buy every videogame console and every game for them
open a museum with all the arcade/pinball machines/consoles and have them up to free play with detailed history of each one
buy a Lamborghini Countash and other classic cars
buy a HUGE house
buy some strippers 
and before all of you guys start complaining "why would you not give any to charities" or "you greedy bastard, all those kids in Africa you could save yet you spend it on your own personal enjoyment"
I WOULD:
give to charity
give to my family
fix up the poor communities
give some to LEGIT homeless people(as some only claim they are for extra cash)
and other acts of kindness
(Topic ID: 69978)
