My introduction to chemistry professor lied to us about a compound we were testing in order to see who would lie about their results and who would be honest eve

My introduction to chemistry professor lied to us about a compound we were testing in order to see who would lie about their results and who would be honest even though they thought they were going to be graded poorly. Pretty sure both the alleged compound and actual compound were mostly harmless so there was little danger in his deception and the lesson was learned by the class to not falsify experiment data.