Jimmy and Tommy went off on their bikes for a picnic in the woods.
They had one bottle of lemonade between then. Jimmy went to explore
while Tommy unpacked the food. When he returned, he found the bottle
was empty.
"Hey!" he exclaimed crossly. "Half of that was mine!"
"I know," said Tommy, "but I was thirsty, and as my half was at the
bottom of the bottle I had to drink through yours to get to it."