Here’s a situation which occurs mostly when travelling by train. You’ve booked a ticket and reserved a seat for your journey. You board the train and find that someone who got on at an earlier stop is occupying your place.
Now for some of you this hardly rates as a ‘situation’. You pleasantly point out that you have reserved this specific seat, maybe wafting a ticket or gesturing to the electronic status display. As far as lively journey anecdotes go, it doesn’t even touch the sides.
But for others, the question ‘would you say something?’ presents an social and ethical dilemma up there with should you tell your friend their partner is cheating on them, and leads to just as much wine-fuelled argument around dinner tables.