1) Any unintended amibiguity, divulgence, or complication that results from a written or spoken statement because the author failed to properly visualize how others would interpret him.
The etymology is from a poster with the screen name "KainMorpheus" on an online forum (www.intellectualwhores.com/forum).
2) "k error"
Imagine the following test question:
1) Blah blah bleugh blippity blah blah?
a) Between 60 and 75%
b) More than 40%
c) More than 75%
d) Less than 60%
e) Between 0 and 25%
This is a kain error because the nature of the answer choices themselves reveal the correct answer (d).