August 1st, 2010 | 
Author: I really am so gulible and cannot understand sarcasm for my life. Its so bad! It even gets me in trouble at school with teachers who use sarcasm and i acually follow through with it and they get very angry at me. At the moment i cant find an example but i hope you understand what im talking about.
I have ADHD, which may contribute to the unable to read facial expressions part but seriously is this a condition?
Posted in 
Tags:
Yes, there is a DSM-IV-TR condition that is a social communication disorder and makes sarcasm, idioms, puns, reading facial expressions all very difficult. Taking things literally is another classic symptom of a PDD. It is an autistic spectrum disorder that is dx autistic disorder 299.00, asperger’s syndrome 299.80 or PDD.NOS (atypical autism)
ADHD/ADD is considered to be part of the autism spectrum according to many neurologists though the DSM-IV-TR hasn’t been updated and many feel its outdated. These disorders do tend to run together (co-morbidities) and in families.
Sometimes when one dx is made (either ADD/HD, or a PDD which is an autisitc spectrum disorder) the other issues are largely ignored resulting in a late dx.
http://www.asplanet.info
go under AS symptoms/AQ test
This i find pretty indicative, my score is a 42, over 32 is significant for asperger’s syndrome, and an average female score is 15
Beetlemilk’s answer is spot on. My husband is the same as you….Asperger’s is what we suspect he has. It does not have a thing to do with intelligence..my husband is HIGHLY intelligent. He just gets lost in things like you describe and I often have to lean over and explain certain things.
I don’t think it is a condition on its own but it can be a condition of certain developmental disorders. I am not saying you have a developmental disorder. But some people have trouble communicating (or for example, reading sarcasm) and this can be developmental. Maybe it has nothing to do with any kind of diagnosable disorder. Maybe you just take things very seriously at face value and are a "black and white" type of person. Try not to read too much into it.