Once upon a time, there was a little boy named Tim. Tim loved to play with his blocks. He would stack them high and tight, making tall towers. One day, Tim wanted to build the biggest stack ever.
Tim worked hard, and his stack grew taller and taller. His friend, Sam, saw him and wanted to help. They worked together, taking turns to put blocks on the stack. They were having lots of fun.
But then, Tim wanted to finish the stack by himself. He didn't want to share with Sam. Sam felt sad and went away. The stack was almost done, but it fell down because Tim was not careful. Tim learned that sharing and working together is better than doing things alone.
