I found this on Wikipedia:
Pyrex, while more resistant to thermal shock than other types of glass, should never be subject to drastic or uneven temperature changes, such as when taken from the oven and placed on the stove elements (an excellent heat conductor) to cool, or immersed in cold water when hot. This can crack or shatter the dish.
However, recent reports suggest that due to the change in manufacturing, notwithstanding the claims made for Pyrex, the glassware can shatter violently and unexpectedly, even when used in accordance with manufacturers instructions. Claims have been made of severe personal injury during these events. Some reports have suggested that older Pyrex was not as susceptible to these problems as currently produced Pyrex. It is unknown whether this has anything to do with the recent change in ownership and location of manufacture of the Pyrex brand.Crazy, eh?
Thanks for RUINING Thanksgiving Day, Pyrex.
At least some good came of it...my oven is now cleaner than it's ever been!
Thanks Pyrex. You're the best.