Most of stand-up comedy's jokes are the juxtaposition of two incongruous things. He also is given to incongruous juxtapositions of beauty and ugliness or antique and modern. Evolutionary game theory has been used to explain many seemingly incongruous phenomena in nature. Though completely incongruous, the shift in tone is audacious and the music disarming. That version seemed incongruous and aroused distrust among the investigators. "Bulletproof Heart" met with unflattering reception, with critic Robert Christgau calling it "incongruous". These preoccupations are incongruous with the mood of the subject. Lemony Snicket frequently explains words and phrases in incongruous detail. The group were incensed, feeling that the choral overdub was incongruous and an embarrassment. Despite the incongruous nature of his hometown, he purports to exemplify inner city culture. Another source of humour is the frequent use of stock footage in incongruous situations. The progression system was also criticized for being incongruous with the narrative of the game. Often these have included incongruous references to fingerless gloves. ToddVanDerWerff of "The A.V. Club" criticized its slightness of plot and incongruous musical numbers. Shirky labels this incongruous exchange as asymmetric.