A popup like this has helped Josh to increase his email subscribers, so he jumped from 1,000 to 28,000 subscribers in 1 year only.
This popup is new and people are not used to seeing it! that's why it grabs and forces your visitors to pay attention to your offer.
While your visitor is scrolling down, your picture or illustration will show up suddenly so it grabs the attention immediately, and after 1 second it says:
" Hi there! Can I share a cool thing I’m working on with you? ".
This question makes your visitor curious and will lead him to click on Yess.
You can use the Yess as a redirect to another page, on the same page, or to open your email form.