How effective is a pocket car window breaker?

[seazal]

I think this stretches my skepticism to breaking.
I will put my money on 'fake' until convinced otherwise.

I used the wildcard "salt window break" in youtube…



So how does the salt break the tempered car side window? By molecular action?

 

[DaveC426913]

So how does the salt break the tempered car side window? By molecular action?

I'd say by spitting a piece of hardened porcelain into his hand before throwing.