Aliens!!!!

I was just reading an article about people who believe in aliens. To me, that's a very far fetched idea, but I guess we never really know.

Supposing aliens really do exist, at Halloween, do they dress up like us as humans like how kids dress up as aliens? Do they find it funny that people pretend to be aliens when they dress up like them?

Immigrants are often called aliens. Do the aliens from another universe get upset because they "stole" their names? Furthermore, do aliens from other countries get upset because they are being grouped with other worldly creatures?

If aliens can travel here supposedly, why can't we find them in other universes? How did they find us? Our universe is very large, but they keep stalking Earth? And only in the United States or Canada or our navy ships? Do they stalk any other continents or other countries armed forces? What is the aliens fixation with America?