Reply #11: I don't think it was intentional

[jmowreader]

or at least I HOPE it wasn't intentional...

Here's what I think happens: In a Roomba kit you get these little "virtual wall" things--they're used to keep the vacuum from falling down the stairs. When you put two vacs in proximity to one another, whatever the virtual-wall system uses to keep your vacuum from meeting an untimely demise causes the two machines to attract each other--and voila! Instant Battlebots!

If you decide to try the Battlevacs thing, we used one Roomba Discovery and one Roomba Red.