A: all crows are black
B: It is clearly not true that all crows are black .
A: The evidence clearly shows that all crows are black .
B: all crows are self-evidently not black .
A: It should be obvious to anyone with half a brain that all crows are black .
B: It is quite obvious that it is not the case that all crows are black
A: You're wrong.
MoonShadow/FlameWar