Instapaper auto-shows the toolbar when you near the end of an article

Instapaper, a great read later service for iPhone, iPad, Android, and the web, helps you take action on an article once you’re almost done with it. When you get near the end, Instapaper’s toolbar will slide in from the top, presenting buttons such as like, archive, and the action button for sharing or filing the article away in a folder.

It also serves as a bittersweet warning that a good article is coming to an end.