
Not to mention that they almost always look very off: they usually impersonate the Vista/7 style in the default color scheme, failing to fool those who bothered changing the color scheme, let alone those who use other operating systems. Designed to trick gullible users into downloading spyware and will get the makers in hot water with the Better Business Bureau (I-A-2, second bullet point).
Any web ad that disguises itself as a Microsoft Windows dialog box. Most of these sorts of ads are from rogue antiviruses or ransomware scams based out of India or another third-world country, and you'd be surprised how many people fall for them. Some ads can easily cross into Nightmare Fuel territory, namely because they cover your whole screen, attempt to terrify you with a false statement of your computer being infected, and then prevent you from leaving the page normally. Thankfully, some web browsers, including Firefox and Chrome, now not only show an icon on tabs that are playing sound for quicker squashing of those ads, but let you click that icon to mute the tab without leaving your current one. It's not as annoying if your computer's sound system has physical controls for volume on it, but if they don't - and you haven't turned down the sound on the computer itself - you just wonder what made the companies think annoying you is a good way to advertise their product. To make things worse, certain sound-playing ads are actually a whole commercial, and are designed to begin playing their audio before the page is even open onscreen so you're forced to either listen to it or click around wondering which open window is playing the sound. Any ad that automatically plays sounds is more likely to make the user mute their volume or close the page than to catch their attention.
Yes, it does cost money to ruin our lives, but do these execs seriously believe that clogging up people's modems so their logo can fly across your screen and obscure the text you're trying to read will create a positive reception for their product, especially when nobody who's the least bit worried about their reputation employs that strategy?
Many, if not all, animated web and pop-up ads can easily fall here, especially if you have an older, slower OS or are browsing using a mobile platform.