A: all llamas are stripy
B: It is not evident that all llamas are stripy .
A: You're quite wrong, the earth is made of green cheese
B: It is clearly not true that the earth is made of green cheese .
A: The evidence clearly shows that the earth is made of green cheese .
B: I dispute your premise.
A: Sir, you are a buffoon.
B: Sir, you are a buffoon.
MoonShadow/FlameWar