bombshell (n.) 突發而驚人的事
stun (v.) 驚愕
e.g. The Dumbledore bombshell has stunned Potter fans around the world and left many wondering why Rowling waited until the conclusion of her seven-book series to reveal the sexuality of the Hogwarts headmaster.
Example from: "Rowling knew early on Dumbledore was gay" by thestar.com