You're arriving at a site through a social media link, or news story, or a search, and you start reading the article. All good so far. However, within a few seconds (often less) there's a popup inviting your to subscribe to their newsletter which covers the content.
Come on, i've not even had time to digest the story and information to make a decision to subscribe. In most circumstances like this, I back out of the site by closing the browser window almost immediately.
</rant>