After my biggest disappointment in mankind and relationships (she was my first gf, we were just about to get married (actually had only few weeks left till the ceremony), she spoke a different language, we already had an appointment with official translators (as it was a must), I already got a job by a company in her home country and was ready to move there any time.. long and boring story anyway, to sum it up, she just dumped me without ever telling me why), I was very close to death. Actually, all my fortune was that I was an active sportsman that time, and my heart could run at high rates without having a heart attack. Normally I would die with a pulse I had (nearly 220 per minute).
Anyhow, this experience changed all my life. Since then I'm happy that I'm alive, and I see every day as a gift. I learned to be happy for the smallest little things of life (like a small flower next to the road). And even if I have a -10 day (like today), I'm still very happy to be alive. Because if I wouldn't be here, maybe no one would notice that little flower next to that road.
And THAT is, what would be really really sad.