h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

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The aliens have landed!
It's distressing, but they're here.
They piloted their flying saucer
through our atmosphere.
They landed like a meteor
engulfed in smoke and flame.
Then out they climbed immersed
in slime
and burbled as they came.
Their hands are greasy tentacles.
Their heads are weird machines.
Their bodies look like cauliflower
and smell like dead sardines.
Their blood is liquid helium.
Their eyes are made of granite.
Their breath exudes the stench of foods
from some unearthly planet.

And if you want to see these
sickly, unattractive creatures,
you'll find them working in your school;
they all got jobs as teachers