I answered "yes". In the "old school" meaning (see in the "jargon dictionnary" : Meaning of hack : Hacking might be characterized as ‘an appropriate application of ingenuity')

I just enjoy "knowing how it works" (mainly in computers).

For me, lucid dreams are perfectly in the hacking spirit: this means going beyond the standard usage of our brain capabilities, and do something with them that was not planned for, but is nevertheless very fun. If I was a "cracker", I would have the same knowledge, but using it for personnal greed instead, like brainwashing others.