This weekend, the friendly alien in "Paul" will no doubt delight audiences with his shenanigans. Aliens are a staple of movies - and they don't always come in peace. Here are 10 of our favorites.

This weekend, the friendly alien in "Paul" will no doubt delight audiences with his shenanigans. Aliens are a staple of movies - and they don't always come in peace. Here are 10 of our favorites.