![Blue Screen of Death](images/bsod.png)
notes:
* https://en.wikipedia.org/wiki/Blue_screen_of_death#/media/File:Windows_9X_BSOD.png
![Blue Screen of Death on ATM](images/bsod.on.atm.jpg)
notes:
* https://www.flickr.com/photos/tony_wasserman/3484632244
> **BSoD** is an error screen displayed on a Windows computer system following a **fatal system error**. It indicates a system crash, in which the **OS has reached a condition where it can no longer operate safely**. ([Wikipedia](https://en.wikipedia.org/wiki/Blue_screen_of_death))
> A **state machine** is a mathematical model of computation. It is an abstract machine that can be in exactly one of a finite number of states at any given time. The FSM can change from one state to another in response to some inputs; the change from one state to another is called a transition. An FSM is defined by a list of its states, its initial state, and the inputs that trigger each transition. ([Wikipedia](https://en.wikipedia.org/wiki/Finite-state_machine))
![Turnstille at Toilet](images/turnstille.jpg)
![State Diagram of Turnstile](images/state.machine-turnstile.svg)
![Watchdog](images/watchdog.png)
notes:
* https://www.uihere.com/free-cliparts/french-bulldog-pit-bull-clip-art-watchdog-5810491