>This is due to the water lifting the impurities off of the glass and allowing a direct glass on glass contact, at which point they fuse and have to be broken.

>This is due to the water lifting the impurities off of the glass and allowing a direct glass on glass contact, at which point they fuse and have to be broken. I don't believe this. I think it is more due to dirt on the glass that gets mobilised by the water. occam's razor...