This is no joke. Air, as we know, consists of 78% nitrogen in the form of N2 molecules. A sound wave propagating through nitrogen gas will, due to the elongated shape of the molecules, lose some energy as it imparts a spin to the molecules, resulting in sonic jitter. For utmost quality in sound reproduction, it is thus recommended to replace the nitrogen in the listening room atmosphere with a blend of approximately 67% neon and 33% argon (to maintain the speed of sound). Ideally, the oxygen should also be removed, but doing so limits listening sessions to a minute or two. This practice is known as audiophilic asphyxiation. Needless to say, it should only be attempted under supervision.