Undergraduate / The day that my parents bought me my first Tarzan..Penn Supp [4]

Can someone please help me fix this sentence. It seems like something's wrong with it. I want to make it as much as a hook as possible.

The day that my parents bought me my first Tarzan 100 piece Jigsaw Puzzle back when I was in first grade, was probably the biggest regret of their lives. From then on, there was no going back.