Frontier Developments know what players of a game where you build your own theme park and daring roller coasters want. Since they know what players want Planet Coaster crashes are a thing you can orchestrate with devastating/brilliant effect.
So, after you have built your smooth running amusement park and pulled in all the visitors you take a break and just make things which will fail in spectacular fashion. For example, you could build a roller coaster that has its rail suddenly end facing the visitors on the walkway, kind of like Frontier Developments did in the trailer below.
Planet Coaster launches for PC on the 17th November 2016.