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In Switzerland's airports they give you a receipt where you can collect it for $10 when you get back. They once confiscated a bike tool of mine. Why they only picked the adjustable wrench out of total 3 potential weapons is beyond me, though.

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You could have then gone to the duty free shop and purchased two glass bottles of vodka. Smashed together they would likely make much better weapons.

If you smash two bottles together, do they both break? I would have expected that you'd always end up with one broken bottle, one whole bottle, and (optionally) a fair amount of your own blood.

When two cars collide head-on, does only one of them crumple?

I figure the same effect would apply to two similar glass bottles colliding.

Except a car can crumple almost any amount from zero to tiny cube, while a bottle can only be perfect or shattered. Plus, bottles have strong and weak points, and it seems less likely that you'd bang two equally strong portions of each bottle together; more likely you'd be hitting a strong corner with a weak wall.

This is SO off topic, and SO unimportant.... :-)

Last time I passed through a Swiss airport I was handed a screwdriver to gouge out the contents of my Zippo lighters.

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