When visiting this blog post on my Android phone, the ads (or something) redirect me to a page with popups telling me my phone has a virus and encouraging me to install an app to 'clean' it, using Google branding on some dodgy domain. I seem to get a different one each time.

Reported it at https://www.google.com/safebrowsing/report_phish/ but mentioning here so that others don't fall victim to it.