I am not a fan of April Fools jokes. Not by a long shot cause most are, well not very funny. However, Google seems to be able to pull off their jokes more often then not. And a case in point is their AdSense for Conversations. Google explains at their Inside AdSense blog:

Now, in just a few simple steps, you can begin displaying ads that are relevant to the topics you’re discussing—in an unobtrusive screen above your head.

Anyone taking part in the conversation can hit the ad with their hand to immediately take advantage of the product or service being offered. With our new Teleportation Technology(TM), you’ll be transported directly to the site where the service is available, or have the product appear instantaneously in your hands.

How do I add Google ads to my conversations?
Once you sign up . . . . we’ll send you an adjustable screen and special AdSense headgear to attach it to.

Why are my ads not targeted to my conversation?
If you’re not seeing targeted ads, it may be that you haven’t discussed a particular topic long enough for our system to determine the meaning of your conversation. We recommend rambling and repeating yourself to help our system pick relevant ads to display. Also, you may wish to try our voice targeting feature—you can speak more loudly to emphasize certain phrases. However, these activities may result in socially awkward situations, so please proceed with caution.