If someone has given you 100btc and told you to use it to buy something you like within 1 hour otherwise he'll take it back. What will you buy?

well, forced to convert it out of btcs, then would probably exchange it for something else which will hold value. probably gold from
http://coinabul.com as far a practical or nonessential items even ... maybe a few of the 375,000 items from
http://bitcoindeals.com would be where that 100 was spent.