Many people find analogies a useful way to characterise new concepts, either to explain them or to remember them. This one’s straight from the top drawer! 🙂
In Scrum, the roles of Product Owner and ScrumMaster are akin to a Zookeeper…
The Product Owner feeds the developers (with the Product Backlog).
The ScrumMaster cleans up all the sh*t! (removes impediments).
ScrumMaster anyone?!