What does ' I happened to be outside' mean?
What does ' I happened to be outside'? mean?,I have seen that 'happen' is used that kind of way many times .
I didn't learn it at school I suppose. Can you guys explain what that exactly mean and How I can use it in a daily converstation? If you can give me some examples, it would be so nice!

Thanks a lot for your help in advance
Cheers!
Hyunwook

Question

What does ' I happened to be outside' mean?
What does ' I happened to be outside'? mean?,I have seen that 'happen' is used that kind of way many times .
I didn't learn it at school I suppose. Can you guys explain what that exactly mean and How I can use it in a daily converstation? If you can give me some examples, it would be so nice!

Thanks a lot for your help in advance
Cheers! 
Hyunwook

Answer

I happened to walk in at the perfect moment.
I happened to see the show at the right time.
I happened to be in the wrong place at the right time.
It means something happened by chance.  
happened to - basically meaning by chance, good luck or bad luck.
You were there at the right time to see it.

Answer

"I happened to be outside" means "By chance / by coincidence / through a set of unrelated circumstances, I was outside."