Balloons are like happiness

A professor gave a balloon to every student to write their name on it and throw it in the hallway. The students were given 5 minutes to find their own balloon. No one found their balloon.

The professor told the students to take the 1st balloon they found and hand it to the person whose name was written on it. Within 5 minutes, everyone had their own balloon.

The professor said to the students: "These balloons are like happiness. We will never find it if everyone is looking for their own. But if we care about other people's happiness, we'll find ours too."