I didn't buy a pizza using bitcoin to celebrate as i couldn't find anyone who would accept it! However, i did buy one from the local supermarket and cooked it at home 
That guy would forever remember and curse the day that he choose to make such a transaction. I really hope that it wasnt all ththat bitcoins that he had and that he didnt make other transactions like this.I really doubt it, you must be living a pretty sad life if you're constantly looking back on stuff like that and get upset about it.
Should I be getting mad every day because I didn't save 10 BTC that I bought for 100 dollars each? It's just a pure waste of time, no-one could have known it would get this big.
It's very easy to say 'he should have done this or that' years after the fact, with the knowledge you now have.