Tommy Wiseau is a Polish actor who directed, co-starred, co-produced and co-wrote the best bad movie of all time A.K.A. The Room, which was given the RiffTrax treatment. Much like his character in the film itself, Wiseau is rather nonsensical in real life as well.
In summer of 2014, RiffTrax did a live riff of 1998's Godzilla. During the riff, there's a scene where Matthew Broderick's character goes into a shop and Bill Corbett does a direct reference to the flowers lady who talks to Wiseau's character in The Room: "Oh, hi Johnny! Didn't recognize you there."