Okay - just a mindless little post for fun.
The electronics I am impressed with really aren't modern, just cheaply produced today. My Wife bought a Xmas decoration at one of those dollar stores, and yes, it was one buck. It plays Jingle Bells when it senses motion, and it does that maybe too well.
We hung it on our tree and went about getting some lunch. We noticed it being triggered fairly often and assumed the cats were moving around by the tree. No - they were asleep. So we figured we got a bad one that triggered for no reason at all. No - we had hung it facing the front window and the road outside. Now, the window is double pane insulated glass and the distance to the road is 75' of yard, 8' of front porch, and 15' from the window to the tree. After sitting down in the room with the decoration, we became aware of what was triggering the little sensor, it was cars passing on the road outside. We noted this more than enough times for a scientific conclusion that that was indeed the triggering mechanism.
I find that pretty amazing for only one dollar and music as well. I could have used that in 1969 when I worked for the state DOT as a "car counter" on roads they were considering repairing or improving.