Warning: This is not a popup GIF per se but it might give you a little jolt. Nicely designed that way. Have a very close look; if you don't see it with a once-over, keep looking. It's there.
I suppose 'popupophobia' might be a good neologism for the fear of popups, because it's a very real phenomenon. Personally, I think people who make the nasty popups with demon faces and loud, horrifying accompanying sounds will have a small karmic debt to pay, because they do deceive and frighten unsuspecting children, even scar them psychologically. They are not good things.