For me it would probably be the day I split up with my ex girlfriend (emo lol). We'd lived together for two years and been seeing each other much longer... both thought we'd end up marrying and both still do further down the line. Why is the most life changing event?
As a direct result of the split I am moving to Korea to go do the whole teaching English thing that thousands do every year. I've handed my notice in at work and shall be leaving after my brothers wedding in September (screw the IT industry... it sucks!).
I'm absolutely terrified as I'm going out there alone and leaving all my friends and family behind. I don't intend to come back to the UK for a good few years, if at all, and plan on using the teaching experience I gain as a springboard to hopefully see many different countries and cultures.
I just really hope I'm capable of doing it. I don't usually have a fear of failure but I have an extreme fear of it with this as teaching is what I've always wanted to do throughout my life and if it goes pear shaped I'll be completely lost whilst I figure out what to do. At the same time I'm incredibly excited. It's a very odd mix of emotions.
*ahem* Sorry to rant
After the above, the most life changing event was my first mushroom trip. It changed many of my views over night and lead to the most fun hazy years of my life, opened my mind up to countless genres of music and eventually lead to me being completely burned out and having to take a well deserved break. Wouldn't change a second of it