For example, .....................I am in an elevator with a guy, but.......suddenly, he attacks me for no reasons. He grabs me.....let's say........a bear hug. What do I do?

For example,............leisurely going up the floor on the escalator......then, this dude chokes me. What do I do?

For example,......playing football on the field. After the practice, I get sacked due to group of aholes who deemed me as "unfit' for their team. What do I do?

These are SOME of scenarios......................... would love to hear your solutions!
And.... do remember my title, eh?