Place: Standard-sized American 1st grade Classroom.
Situation: The students are led in a sing-along by their teacher. As part of the song, they are required to perform various noises using their appendages. Clapping, finger snapping, and foot stomping are all part of the routine.
Camera zooms into one particular student, who is following along with the clapping and foot stomping. We see his facial expression change when he realizes finger snapping is next, and his fingers randomly mesh against each other to no noise-making effect.
Yes, I cannot snap my fingers. This has haunted me my entire life.