But what's the problem. (Score 1, Interesting)

I've got a question. Has anybody ever (outside of a movie) managed to hack into a system behind a completely locked down firewall. This laptop has every port closed, with the exception of 22. As I see it the only source of attack is to try to hack in through SSH. Assuming all ports are closed, it should be impossible to get in, that's the whole point. So my question is whether anybody, in the history of the firewall, has ever managed to get in through a firewall like that? I don't see how it's possible, where would you start.

Just thought I'd challenge the knee-jerk reaction of "WTF, who would do that!"