>One got angry and banged his fists on the table...

Sounds like a touch of autism, or similar mental state. I know a guy who 
does this sort of thing when he gets frustrated when things don't go right. 
On the other hand he has an incredible memory and can recite all sorts of 
disparate facts on a wide range of subjects. His biggest problem is he 
doesn't seem to realise his 'handicap' (for want of a better word). 

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