Do you realize it is harder than you might think to break a window?

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Until this morning I thought it was so easy to break a window, as my sons had broken a few with baseballs and etc over the years.  This morning I was locked out of our garage, as someone locked the lower lock, not the dead lock and there is no key for that new lock.  All my tools were of course locked in the garage, so no drill to rill out the lock, no hammer to break the window and not sure how to go about doing it.

Took my meat cleave with a towel and hit as hard as I could about ten times with no result.  Stood and looked at the window for a while and thought I might just throw a nice big rock and see what happens.  Happens it broke the first layer of the thermal window, but had to throw it a second time to get all the way through both layers.

It actually felt good when it worked, as I had to make it to an appointment.  I never did like the mullions in this window and thermally it had failed, so maybe it was a good thing.  A new window will go in next week and those ugly mullions were pretty much destroyed by the rock.  Rock is my friend today.

Do you realize it is harder than you might think to break a window?