This happened in Australia's rout of England in the Ashes test. Take THAT, England!
(In case you don't know what a crumpet is, this is extremely rare. It's not like a bat breaking in baseball. And even rarer on a block. And at that point on the bat. OK, I'll shut up and let you watch slow-mo video of a bat breaking in half. Coooooool.)
(h/t to Reddit)