Computers must be female. No one but the creator understands their internal logic. The native language they use to communicate with other computers is incomprehensible to everyone else. The message "Bad command or file name" is about as informative as, "If you don't know why I'm mad at you, then I'm certainly not going to tell you." Even the smallest mistakes are stored in long term memory for later retrieval. As soon as you make a commitment to one, you find yourself spending half your paycheck on accessories for it.
Computers must be male. As soon as you commit to one you realize that if you had waited a little longer, you could have obtained a better model. In order to get their attention, you have to turn them on. Big power surges knock them out for the rest of the day.
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