6. The "Excuse Me! Stranger"-Hug; Apart from these people you get comfortable with, a hug from just anyone is not appreciated. Well, you don't want any random individual jumping into your space bubble. With common consesus, this holds good for everyone. Even my Lizzy. She expresses that by growling back.
(this is just for representation, courtesy Google Search results)
So, take my advice, the next time you plan on going for this physical act; run through the above checklist in your head and make sure you're not in one of those creepy ones.