In the Information Age, nothing is coincidence.
A while ago I just remembered the Inception movie and how awesome it is.
Just now, in my rss feed there is a video, a prenup video, that was based from the Inception movie.
While searching something in Google, there was an advertisement for Lucid Dreaming.
Back in 200x you'll think it is a very rare concidence. But nowadays you know it's nothing but the result of smart SEO algorithms, subconcious advertisements and user-click monitoring.