I think I've figured out why aliens always seem to crash their ships.
Why does every one that claims to see an alien always say they're green (not really)

Because they come from a dry (as in prohibition) part of the galaxy. They come here and drink our whiskey, get sick from alcohol poisoning and crash. Or push the wrong button and blow themselves up. Damn intoxicated aliens.

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"The universe is driven by the complex interaction between three ingredients: matter, energy, and enlightened self-interest." - G'Kar