Jetta’s dad explained that a brainwave is a sudden, clever idea or solution that comes to mind. The ice-cream man had another brainwave about bowling at the bowling alley, and Jetta’s dad mentioned it when it was just him and Jetta. This idea brought a smile to their faces, as they thought about the fun they could have together. guess who Jetta met at the bowling alley the bus driver Jetta said to him