Exponential growth (or decay)
Humans are really bad at estimating a lot of things. Exponential growth is one of the hardest things for people to understand. I’ve seen countless graphs with slow growth curves that have caused enormous outages. I’m thankful no system I have been responsible for has caused any physical harm to people.
The 60 minutes after the Titanic hit the iceberg it was reasonable for people to think everything was going to be fine. However, there was nothing you could do to stop it. It was a tragic and unfortunately similar events have happened since and will happen in the future.