I accidentally found what I think is a new easter egg in the Roamio remote. (I would imagine that it's in the new slide remote too, but I don't have one to test.)
Press and hold the TiVo and Play buttons on your Roamio remote until the LED lights up. Then release the buttons.
It seems to repeat until you press another button.
If this is old news, sorry, but a quick search of the forum didn't yield any existing threads on this.