Have you ever made a decision on some stuff and realised you made a mistake?

Quoted by Ting:
The worst case is when you finally decided but then realised that the decision is void and you are back to square one.

So what do you considered as a bad decision?
Do we regret?
How do we rectify it? Or are we not able to rectify it?

By the way, my boss decided to tender her resignation. Haiz... Decisions again.

There are many occasions whereby I regretted the decision I made thus resulting in many missed/lost opportunities.

Life is about making decisions, isn't it?
Life is about making the Right choices?
Life is about getting headaches while making decisions?