If you're a boy, then chances are you've been sack whacked.
It's an incredibly unfortunate thing to happen, deliberately or accidentally, as it can cause pain for several minutes.
Sack whacking is an age-old tradition where blokes hit other blokes in the balls because they know it's extremely painful. Sometimes it can be an accidental flick of the wrist that hits the sweet spot or it can be a malicious attempt at wanting to make someone keel over in agony.
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Well, one private school in Perth, Australia, is taking action against this sort of behaviour by banning it.
Students at Trinity College have been told that if they're caught 'tapping' each other in the groin then they can expect to face some pretty big consequences.
Clint Testa, Trinity College's head of Year 7, had to sit all the boys in the year down and have a frank chat with them about the dangers of sack whacking.
"It was a difficult conversation to have with 180 13-year-old boys, but I impressed upon them the dangers associated with this bit of 'fun' and that not only can it lead to some serious short-term pain, but can also result in some serious long-term consequences," he told the West Australian.
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"I made it clear that any further reports of such behaviour will result in serious sanctions for the offenders."
He hopes that by telling this to the Year 7 boys, the trend will hopefully die down.
Mr Testa has been backed up by the Australian Medical Association of Western Australia.
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The group said while long-term damage would be the result of a pretty catastrophic sack whack, it's good to get the message out that hitting testicles aren't on.
Association general practice chairman Simon Torvaldsen told the West Australian: "I think the school's right to say we're not going to tolerate this sort of thing.
"The concern is that it can very easily morph into bullying type behaviour."
"It's important that schools do educate kids about what is appropriate behaviour and what's not - and going up to other people and whacking them in the groin is not appropriate behaviour in our society."
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Mr Testa used the year meeting to also discourage students from making derogatory comments to women and people of colour inside and outside the school. While he expresses that the students are usually pretty on-brand, some give the school a bad name from time to time.
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