On average, each bike has a fork.

A mysterious video of what appears to be a pushmi/pullyu tandem bicycle has appeared on the Facebook page of Paul Component Engineering (There's no way to embed, or even to link to, the video here; you need to click through to their Facebook page, and then find and click on the video, which is entitled "Trust us. We're professionaaaaaaaahhhhhhls.").

On the other hand (h/t: cycleexif.com), Olli Erkkilä's beautiful and poetic Graduation Project at the Institute of Design in Lahti, Finland was a "forkless" cruiser: