What behaviors make you think a person is creepy?

In my opinion, behaviors that make someone overly creepy are:
- The way they look around;
- Their facial expression;
- Their body language
(basically their attitute)
i.e. having a body language that doesn't match the situation, etc..)

One big red flag is if they stare at you for a prolong period of time. And the vibe they give off. That gives me the chills and me wanna get the hell out of there.
This is just my opinion, take that into account