The father of your humble narrator works in space science at the Applied Physics Laboratory of Johns Hopkins University. He likes to tell a story about a theoretical discussion he had with one of his coworkers some years back, about tachyons. Apparently the conversation ended when his friend sent him a message on the Lab's then-brand-new email system, something like this:
John,
Sorry to hear about that tachyon fiasco; hope it doesn't ruin your career. I told you it wouldn't pan out.
Steve
The message was post-dated by about three years. Geek humor at its finest.