Hearing an electronics device making an intermittent, repeating sound from somewhere in your house, and not finding either the device or knowing the meaning of the sound.
I was lying in bed awake in the middle of the night, and could not fall back to sleep because of an electronics enigma.
The phenomenon that results in a messy puddle of coffee and grounds on your countertop from your coffee maker overflowing because the carafe of was not positioned exactly where it should have been when you turned it on.
Damn! I woke up to another flippin' java enigma this morning. Now I have to bleach my countertop after cleaning up the mess and then strain my coffee so I can drink it. I'll probably be late for work.