The one I have is pretty much like this – a life-size model for medical students. The top comes off for viewing the interior (little metal hooks latching the top, not as found in nature). The teeth are even removable. One fell out and got lost.
I bought it because I wanted to use it as a model for drawing practice. When you’re doing portraits, you want to know the underlying structures and relationships.
It also comes out around the end of October when I feel like adding some special effects.
Since it’s really not a common and expected household item, I was curious who else might have them around and for what reason.
You can’t keep a real one, though, or at least not very easily:
https://www.theatlantic.com/science/archive/2019/09/why-you-cant-display-your-relatives-skull/597307/