That was amusing, if a bit odd. One of the sports shows had a pair of commentators standing at a pedestal, with a large virtual screen behind them. Fairly normal, except that something in the floor was interacting with the virtual processing, so the floor seemed to have moving moire patterns flashing away. A bit like a black and sparkle ocean tossing restlessly behind and underneath the commentators, their pedestal, and the back walls.

They did change cameras once, and the floor settled down to a somewhat shiny black floor. Then they went back to the main camera, and the floor started moving again. Actually kind of a neat effect, if it was intentional, but a bit distracting for this show.