Extremely random things i think of every day

Aliens

Alright so, beginning with this,

If there actually is life outside of our planet, which there probably is, we would say they are aliens, right? But, wouldn't they also refer to us as aliens? We would think they look weird, but they would think the same thing. So heres a question:

Who's the alien in the two groups? 

Ok, this isn't really weird thoughts, but the next ones will be weird.