If you’ve ever wondered[1] whether the Internet is made up of cats, think about inactivity timeouts. You watch cats playing, partway through, one of them will stop moving, distracted by something, and the other will wait for a while, then timeout and just walk away.
If you still don’t believe me, look at this picture and think about all the times your computer put itself into what felt like an infinite loop because of something you asked it to do:
[1]As opposed to it being obvious.