I was performing a mental status examination or mental state examination(MSE) on a 9-year-old male patient with a history of Autism Disorder. The kid was doing phenomenal in this examination until I asked him to subtract 7 from 100 (this is called serial sevens, it assesses the mental state and possibly cognition), he couldn’t do it at all. I gave him around 3 minutes and he just gave up. He was giving me different answers: 107, 117 and so on. This was definitely not normal for his age.