Sarcasm

If you don't get the sarcasm, you may be demented. Scientists are now saying that the seat of sarcasm or the ability to laugh at it is located at the brain's parahippocampal gyrus. People with dementia, or head injuries in that area, do not have that pair of horse ranch (para + hippo + camp). And now because sarcasm is humor's dark side and humor is part of our evolution (you don't see bacterias playing) then sarcasm must be good. You don't get it? You are demented.