Being able to instantly respond with sarcasm is the sign of a healthy brain

I must have a pretty healthy brain now. Your doctor should be having a stroke protocol for this.

 

Studies have shown that exposure to sarcasm enhances creative problem solving, for instance. Children understand and use sarcasm by the time they get to kindergarten. An inability to understand sarcasm may be an early warning sign of brain disease.
Read more: http://www.smithsonianmag.com/science-nature/the-science-of-sarcasm-yeah-right-25038/#Vy6of3M9vjW7dqrD.99