A Sofie moment is when a person reaches a level of complete mind-numbness. The person reaches a state where they cannot think for themselves and goes into vegetative state. A person can reach a Sofie moment by receiving multiple head injuries, such as being dropped as a baby or having a brick thrown at their head.
Friend 1: "Bro what's 10+10"
Friend 2: "Are you fucking stupid or are you just having a Sofie Moment?"
Friend 1: "Nah I'm just stupid.."