A Martian Halloween

Who are these little
monsters with bags
all dressed up in
costumes and rags?

Why are they knocking
on everyone's door,
and checking their bags
to see who has more?

Why does the sky
look dark and scary
and the clouds passing the moon
look so eerie?

I hear a howling
this Halloween night
and I know that it's meant
to give me a fright.