What was your last big mistake?

Believing I am in some way wrong for making a mistake as you put it. If you've never done a thing before so don't do it first time as correctly it's called learning, not getting it wrong.

Ahem ahem uh I don't make mistakes I am perfect !

Last night i made a few. Paid for it today.

4 months ago, I decided to let someone in.

Not opening my eyes to the truth

Spelling a word wrong.