system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does a brain anus rhythm instantly kill you

I know it has something to do with blood clots maybe?  But how do you just die instantly?
gpt
Okay...once I've managed to stop chuckling I'll answer this.

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Okay. First off, its aneurysm. It refers to a structural weakening of a vessel wall, resulting in prominent bulging as blood pressure pushes against it. Typically, these aneurysms arise in major vessels, such as the aorta, basilar arteries, carotids, or any of the vessels composing the brain artery complex known as the 'Circle of Willis'.

If these aneurysms get severe enough, they can rupture, causing you to bleed out into your brain. Because these ruptures occur in the major vessels, it results in a rapid, dramatic loss of blood flow to your brain. It doesn't 'kill instantly' but depending on the size and location, it can cause rapid loss of consciousness and subsequent death as your brain becomes starved of blood and oxygen.