Marbles

«Like I had lost my last marble!»

«The idiom «lose your marbles» means to go crazy or lose your mind. It is a figurative way of saying that someone has lost their sanity or their mental faculties. It is often used to describe someone who is behaving in a strange or irrational way, such as someone who is talking to themselves, acting paranoid, or exhibiting other signs of mental illness,  sometimes an alarming way. The idiom can also be used more lightheartedly, to describe someone who is simply being silly or eccentric.»

No Sweat Shakespeare