I was sorely tempted to trick you all but figured the Mods might not like it. Plus chances are this has already been mentioned somewhere else.
So I’ll give you all the chance to scare someone else 
No kids, though, because that would be wrong.
Call a loved one to the computer screen and turn on your sound. “I have a braintwister for you, honey,” you can say in your normal, everyday voice. “There’s these two pictures and you have to find the 3 differences between them, and only, like, 2% of the population can do it on the first try.”
Then go here.
Bwahahaha 
After that, you can take 'em here. Click on “ads” and then “car.” “Hey look honey, the car changes color in the middle of the commercial how cool is that.”
If you don’t have another person around I suppose your cat would get a kick out of it …