Originally Posted By: TANSTAF1
One of my hesitations on buying this is I wonder if it will really work - that is, will it break a window?

Same principle as spring-loaded center punch, which will reliably do the job on non-laminated car window (which excludes windshields).

Some vehicles do have laminated side-window, e.g. some Volvo, Lexus, Jaguar, Mercedes and, I believe, Dodge Ram pick-ups. There are others.

Houdini mentioned in Doug Ritter's Blog.

Shooting Industry Magazine's 2009 Safety Product of the Year
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"Things that have never happened before happen all the time." — Scott Sagan, The Limits of Safety