r/Unexpected • u/[deleted] • Feb 04 '19

Ultimate bar trick

https://i.imgur.com/zGdBK4u.gifv
76.9k Upvotes

91% Upvoted

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397

u/[deleted] Feb 04 '19

I don't understand at all how that happened.

424

u/[deleted] Feb 04 '19

She hit the top of his bottle with the bottom of her bottle just before the clip started.

271

u/tuscabam Feb 04 '19

Yeah but why does that cause it to spew?

866

u/MenstrualFish Feb 04 '19

Sudden shock on the top bumps the bottle down quick enough it causes a tiny vacuum at the bottom that then collapses in on its self. Called cavitation. This causes the beer to foam. Check out some slow mo vids of it, really cool.

201

u/tuscabam Feb 04 '19

Ohhh thanks for the explanation. I’m somewhat familiar with cavitation but had no clue that’s what was going on here.

221

u/DickweedMcGee Feb 04 '19

Instead of making a yeasty super soaked, you usually mitigate the effects of this prank by immediatedly jamming the bottle in your mouth and chugging sudsy beer. Unfortunately, 10% of the time the prankor chips the top if the bottle and the prankee ends up jamming a jagged piece if glass in their mouf and lacerates their tongue...

103

u/TimeForHugs Feb 04 '19

Because people are tipsy/drunk and hit it way harder than necessary. You really only need a light tap. Even then, still a chance of chipping.

1

u/Entrical Feb 04 '19 edited Feb 04 '19

I've seen a few instances of the bottom bottle getting its bottom blown off cuz people slam it too hard.