How do you feel towards people WITHOUT common sense?

It's hard to justify wether a person had really used their common sense or not. I believe all ordinary person with average I.Q. should have common sense on basic and simple things. But sometimes, people are confused or distracted by something else, until they 'lost' their common sense. Panic and pressure is another cause of people act like they do not have common sense. So, we should use our own 'common sense' to analyze under certain condition, why some people lost their common sense. With such thinking, we could avoid to be annoyed and stay happy, cool and calm. Steadiness can help us to have more common sense and resolve problems in the correct way. I have been annoyed by my students for not doing their mathematical problems with common sense. After several attempts, I found that it's because of their language proficiency problem instead of analytical skill. That's how they misinterpreting the question, and seems like do not have their 'common sense'.

there isnt anything more baffling than an intelligent person who doesnt use their common sense. it happens and you just sit there in a state of disbelief lol! and then i at least, ask "you're joking right?" LOL! i find ppl like that unbelievably annoying..rather agitating more than annoying. you say that "no one is born without common sense" i dont know about that. ive known a couple of ppl in my life, and had to suffer with working in the same office as another..who certainly seemed to lack anything remotely resembling common sense.