'I'm sorry I pinched you in the nuts': Boy writes hilariously sweet apology after hurting his younger brother

A nine-year-old Australian boy felt so bad about pinching his little brother's testicles he felt compelled to write him a letter.

The sweet note, which has since gone viral upon being posted to Facebook, expresses the boy's sincere regret at causing his brother pain.

Identified only as Zac, he is said to live in Adelaide.

Zac

This kind note expressed Zac's sincere regret for hurting his brother's nuts

'To the best brother ever,' the note read.

'I'm very sorry that I pinched you in the nuts. I'm so sad that I feel the pain. I know that this note won't completley make it up for you so heres $1.00 all for you! I know it doesn't make the pain go away, and I can't put a band-aid on it! You woldent be able to pee! I hope you're better in the morning buddey!'

'Love from Zac.'

The West Australian reported that the incident happened at the boy's family home, but did not identify the brothers further.

Hopefully, Zac has learned his lesson and his little brother feels better.