Originally Posted by
pinniped
Am I the only nerd here who has memorized my passport number? (Not to mention most FF and hotel numbers, plus my most commonly-used credit cards...

)
I figure knowledge of that number, plus obviously SSN and other personal information, should be a good start towards convincing an embassy official or border agent that I am who I say I am...
Since few people memorize their pp numbers, having memorized yours might set off a flag that "something is fishy

", and have opposite effect: "this guy is a spy..." [Maybe I've seen too many spy movies

]