Copy / Paste Hijacking
A couple of years ago I noticed an annoying trend: sometimes when I would copy and paste text from a website, in addition to the text I had actively selected I was seeing links back to the original website come up. In most cases these are not even pretty links (e.g. with a shortening service like bit.ly), and quite long, but in any case I was having undesired text injected into my selection.
