Worset line ever:
Kira: I wouldn't beleive him if he told me water was wet.
This one hurts just reading it!
Mentioning water being wet is a common English idiom. Usually meaning this is true, real or not worthy of comment. Coupled with "I wouldn't believe him" flips that to show the character is a known liar. A common variation is "the sky is blue", but that does quite work in a multi-planetary setting.