Apple Users

Not that it really matters, but fyi ... the genie effect was introduced with the original OS-X by Steve Jobs in his demo keynote. Check out the following video at the 2:00 mark:

Sadly, it's disabled by default with High Sierra. Here's how to turn it back on (you still need to hit shift to activate it):

https://apple.stackexchange.com/questions/303106/how-to-enable-slow-genie-effect-in-macos-10-13-high-sierra

Also the 'keyboard viewer' (see the keyboard section in system preferences) is occasionally useful to check for stuck keys. When it is enabled, an extra icon is added to the system menu bar that will bring up a nice window showing all your keys (and if they're being held down). It's also really useful to figure out what funky symbol will be generated when you use Option with a key.

But yes, keyboards have processors in them. And when they get confused it can require a power cycle to reset.