Laughing out loud

This morning I was surprised by laughter. It was my husband laughing out loud. It went on for minutes. We found out it was because of a book on remarks of students that a history teacher collected during his lifetime. I gave it to him yesterday evening.
The dutch title is: ''Hoe de duitsers dapper stand hielden in Vietnam.'' (How the germans bravely held position in Vietnam.) It demonstrates the knowledge about important historical facts.