you sassenachs are sooooo civilised
I had the fortune of growing up in Glasgow.
A few lads used to bully a kid in my registration class quite badly. We must have been about 14 at the time.
The kid's dad and his fatty mate waited at the school gates one day and kicked the utter shit out of 5 of us walking home from school together - only two of the group actually bullied the boy. I had my nose broken by a fist and a cracked elbow from a golf club wielded by a 40 year old skin head for no reason at all
We all knew who did it, and why. None of us fancied another beating so we told our parents we got into a fight with some other lads.
I once started a rather harmless rumour at school that a lad was gay and I spotted him wanking our maths teacher off in the toilets.
About 2 days later, his alcoholic father knocked on my front door, politely asked my mother if I was around, and then, with my mother standing beside me at the door, dragged me outside and smacked me clean in the face. I was 16.
If you don't mind the risk of a criminal record (which you're running no matter who any threat or violent attack is aimed at), you might as well just punch the silly cow that beat up your daughter.
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If it was me, I probably wouldn't take the violence route though.
Persistent threatening phone calls at 3am and sitting with your car headlights on the house just after doing it generally gives them the shitters and the cops are pretty powerless (unless you call from your mobile doh!)