years ago I was famous for doing that.. with commercial beer.. must have cost me a fortune at the time as at my worst I blew up (and had to clean up) 3 six-packs in 3 weeks...
I rarely do so these days at all (only sometimes).. and at least it costs me F/A... but I still gotta clean it up
Next time you want to put boiling water in a glass either place a teaspoon in it first or just fill a centimetre or so with warm tap water first.
I often soak my coopers bottles with boiling water and napisan but the jug I mix it in gets a touch of cold/warm water first. Bottles outside on cold concrete, not one has yet cracked.
You probably already know but thermal shock cracks glass. You need to love your glasses more.
I should add my first post on this forum was due to me having stirred some finings for my Kit ginger beer with my hydrometer because I couldn't be bothered going inside for a spoon. Finings were dissolved in boiling water. Not only did I crack the base of my hydrometer into the finings (along with the little metal balls inside) but I didn't actually notice until AFTER I'd tipped the lot into the brew.
Yeah I agree it was pretty silly putting boiling water in there. But I was in a bit of a hurry, and they looked pretty damn thick. I have put very very hot water & napisan in them heaps of times before but obviously that's not boiling water straight from the kettle.
Nice glass art guys. I reckon the fact that it is patterned glass didn't help much either. Differing expansion rates of the thick and thin glass etc... you know the rest.