Liar (It Takes One to Know One) Lyrics

Lyric discussion by dxmachina 

Cover art for Liar (It Takes One to Know One) lyrics by Taking Back Sunday

In reference to the "26 days" being repeated over and over again in the song: could it possibly be in reference to the female mestruation cycle? Hold on, let me explain. I first thought of this when I heard the song: 26? what an odd number to sing about.
As everyone is well aware, some months contain 31 days. Quick math: 31-5=26 (5 days is the 'normal' time period for a woman of age to begin & complete her menses). "We've got 26 days to work with (it moves, it moves, it moves)" I know this is a shot in the dark, but perhaps the songwriters are referring to the path of the 'discharge' (trying not to be too graphic or gross about this) through his girlfriend, how he's got 26 days of 'normalcy' before it's "back on that island that you swear by."
When his girlfriend is in menses, he feels isolated on the "island," perhaps self-seclusion from his girlfriend's hightened state of emotionality, which sometimes accompanies the menstrual cycle. Evidence of this can be seen in the "liar, liar" refrain of the song, which symbolizes the many arguments that the couple has, possibly on a cycle of 26 days since they're "keeping score." Another reference is the "all our secrets they are tailored trouble draped loose now around your hips" line, which could be a direct reference to the menstual cycle and the boyfriend's frustration of being denied carnal pleasure until the 5 days are complete, hence his lamenting/bitching about the 26-day cycle. In closing, I think the vidoe for "Liar" is awesome, the polygraph motif is a unique touch and really brought out the lyrics of the song.