Have you ever figured out that a friend of yours just "acts" unintelligent on purpose...

题目

Have you ever figured out that a friend of yours just "acts" unintelligent on purpose...
...and the reason you figured that out was that it occurred to you suddenly that nobody could be that dumm?
(For a certain percentage of answerers out there,the misspelling of the word "du mb" was on purpose to fool the profanity-finding word program they use to prevent bad words like d u mb,so please don't mention that,that would upset me needlessy,one two three go?)

答案

I've seen many "intelligent" people acting dumm to take advantage of others. I just can't understand why there are always some "over helpful and clever" guys who would volunteer to give a hand. So who is really the clever one?