I have a friend who is browsing on the website of Dean Safes (in other words, a long-standing legitimate company) and he hit a road block: an optional subscibe pop up box.
It's like some kind of flash display box, not a new window opening up. It's darkens the page and won't let you go unless you optionally subscribe. I'm not kidding you. You refresh the page, it pops back up. There's no button to close the box. I tried entering a fake e-mail to see if the optional subscribe box would go away, but instead it tells you to click on the link sent to your e-mail. Since it's not a seperate internet window, I can't use Task Manager on it to end it.
He's using Google Chrome and Wibdows 10.
Clearly this was designed to be evil.