Less luck than you think

Think about it. You step on some lego piece.

1. you are walking bare foot
2. there is lego
3. lego isnt cleaned up
4. you did not look out

You are just waking somewhere and a object falls on your head.

1. the object falls
2. you are walking below it.

An accident is never a single incident its always a combination. Or else you got lucky.