Explain xkcd: It's 'cause you're dumb.
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Roomba is a brand of domestic cleaning robots manufactured by the company iRobot. The robots are designed to automatically vacuum floors. Randall has often included these, sometimes giving them pet-like properties (or at least letting the owner treat them as pets).

Roomba is also mentioned in 1506: xkcloud. However, it is not Randall, but the users who have included that, and that comic should thus not be included as a Roomba comic here.

Below is a list of comics where Roombas are mentioned.