Because they're not garbage collectors.
The human race.
A. because he wanted to help untie the human race.
Untie the rope...
Oh wait thats Nicki Minaj. Why would an alien in a wig pick Nicki Minaj as a name
With Starbucks!
Mary. Lied about her extramarital affair, still believed by billions.
Because anything more than that might cause an invasion by the United States of America!
Pick up lines
The human one.
Motorist: So I could race home to get my license and registration.
The Tortoise or the Reddit Servers
First, invade ze kitchen...
The US might invade it.
A first-aid kit!
A high-jacker.
Brexit
A good friend will help you move house A really good friend will help you move a body!