Tracey is just waiting for Shamus so they could finish their flying machine for their science project. Shamus just bought a new skateboard that almost took his allowance. When they made up some minor mistakes on the plane, Shamus' new board just broke. Tracey wanted to fix up the board and just trying to take it away from Shamus, it just broke into pieces. Also, Tracey had to get new wheels for her flying machine. She could find anything else that was perfect except for Shamus' wheels. She used it without asking Shamus and this started the argument. But afterwards, it really started to bore Tracey to invent by herself.