This is an old case study from 1982 that isn’t haha funny, but sure is interesting. It’s about a patient who had seizures when doing mental arithmetic. The really weird part is that the medical staff were able to detect abnormal brain activity when the patient was doing multiplication and division; however, addition and subtraction seemed to cause no problems. Even if this doesn’t really add up (groan!), I guess it just goes to show how amazingly complex our brains really are!