I admit, this entry is very far-fetched (or near-fetched, depending on your camera position), but I'm sure you can come up with actual use cases for this. One scenario I can think of is that if you have a CCTV in your factory or whatever and something should stay within X meters from the camera, you can do it with this trick.
Can you verify if your iPhone battery drains faster during summer compared to other seasons with Zabbix? Of course you can!
I'm entering a whole new level of monitoring and "What's up, home?" could now also be called "What's up, me?". Recently my colleague did hint me about Home Assistant's HomeKit Controller integration just to get my HomeKit-compatible Netatmo environmental monitoring device to get to return value back to Zabbix without my Siri kludge. One thing lead to another and now I'm monitoring my iPhone and Apple Watch -- so, practically monitoring myself.