A totally unexpected situation can occur when you least expect it! Such as when your younger brother answers the door, completely and fully nude - with a major boner sticking out - and as he tries to explain the 'whys,' another man shows up at the door in the very same condition! Wow! That kind of a situation is obviously totally unexpected!"
When your co-worker - that is supposed to spend the company meeting "free afternoon" with you - gets all turned on and excited, because of a Cops TV program that he just saw when the patrolman body searches a young man - that can definitely be a totally unexpected situation! And a situation to be dealt with, man to man!
Nine situations all "just seem to happen" - totally unexpected - but each situation, creates its own actions and reactions, and its very unexpected hot results and solutions!