A Martian Halloween

I just saw his shadow
go past the tree.
It looks like this monster
is much bigger than me.

I'll bet he has three heads,
each with one eye
and if you look into all of them
you're sure to die.

His steps are getting louder,
he's getting close.
He must be
ugly, slimy and gross.

Why did I ever
come to this place,
I should have stayed up there
in outer space.