Most times banner ads are clever enough to display ads relevant to the page you’re reading right now – like if you scroll to the bottom of this post and look for the Google AdSense banner, it will most likely advertise for something related to this post (I wonder what that might be).
But at other times, the banner networks really screw up!! Buzzfeed.com collected 23 Badly Placed Internet Ads that probably never should have been showed…