It could be a reference to the ASDF Videos... 22.214.171.124 12:31, 13 April 2014 (UTC)
- Eeeeeeeeeexcept that asdfmovie 2 (the one which includes the "it says gullible on the ceiling" sketch) was first uploaded in January 2010 ... a good 11 months after this comic was published. Given the style and timeline of the asdfmovie shorts, it's rather more likely that they were (as a whole!) inspired by xkcd, not the other way around... 126.96.36.199 15:45, 17 June 2014 (UTC)
Actually it's a really, really old practical joke. Note how cueball is clearly familiar with the gag and doesn't 'fall for it'. 188.8.131.52 15:30, 21 August 2014 (UTC)
- Actually, Blackhat actually says its an old joke.
- In Fastest-Growing we do not even see "Rob" so we do not even know if this is the Cueball Rob... Also just because Black-Hat nows a Rob in one comic this doesn't mean he is his room-mate. --Kynde (talk) 13:18, 15 March 2015 (UTC)
Changed "gaze" in the explanation to "glance", which makes more sense. -Pennpenn 184.108.40.206 04:21, 15 June 2015 (UTC)