Laser pointer is the only game that the cats actually play together. It's pretty cute once they really get going: they take turns running laps of the hallway in pursuit of the red dot (of course they won't do this for the camera). Geoff is driving the laser pointer in the video, which is why the dot frequently appears in such places as inside shoes and on Melly's tail.
On another note: I finally updated the Friends of Scarlett and Melly blog list on the sidebar. If I've missed anyone, I'm sorry and please let me know!