Sarcasm
It has been claimed that certain less demonstrative cultures such as the Japanese and Germans don't have sarcasm, but this is not the case. Sarcasm is fine-tuned to fit a culture, which is why some cultures may not understand ours.
Most recent rearch suggests that sarcasm is an evolutionary attribute, a facet of what antropologists call "social intelligence". Children as young as five can detect it quite easy.
Scarcasm seems to exercise the brain more than sincere statements do. And scientists have monitored the brain and found it works far harder to understand sarcasm. Their findings being that sarcasm is a good thing for our brain.
So do you find sarcasm keeps your brain in trim and keeps you young?