Have you ever bumped into an ex on the street?
It's horrible, isn't it? It's all forced chit-chat, you may be walking the same way. In short, it's awful and you have a violent reaction to it in your brainspace.
This little short film shows what it's like and even comes up with subtitles for them that are - and we know from experience - scarily accurate.
Watch / cringe at this.