The Knowledge is the in-depth study of London street routes and places of interest that taxicab-drivers must complete to obtain a licence to operate a black cab. It was instigated in 1851, and has changed little since.
It is the world's most demanding training course for taxicab-drivers; and applicants will usually need at least 12 'Appearances' (attempts at the final test), after preparation averaging 34 months, to pass the examination.
When an individual drops a particularly insightful piece of knowledge on another individual in an unexpected situation causing a monumental efffect, like the effect of a bomb dropping.
Did you know that the first crusade was launched in order to pillage the holy land and increase the circulation of gold and silver coinage in northern-europe?
No i didn't, and i don't want you dropping knowledge bombs on me while im trying to shark on a girl in a nightclub