(definitions from Dictionary.com)
8. the sudden flame or intense heat produced by a
bomb or other explosive device.
Hitchcock said to show
the audience the bomb right away, but some flash writers prefer the thing to go
off unannounced. It’s not always a bomb that appears to give flash a twist.
Guns, accidents, ghosts, even aliens pop up in endings. I say, “Show da bomb;
be da bomb.”