This article presents information on nervous habits. A case study is being presented in this article wherein a study of 1520 students with respect to twelve behavior patterns are carried out which are listed by W.C. Olson as nervous habits. The problem of detecting so-called nervous reactions assumed added importance when World War II began. From millions of draftees it was necessary to try to weed out the cases of psychoses and the crippling psychoneuroses. Some examiners attributed clinical significance to the presence of certain nervous habits. In the experiment presented in this article, the observer recorded the specific nervous habits for 100 minutes for each group. Twenty students were included in a group, and these subjects were observed in sequence. The observer began with the first student in the group and noted his record, then observed the second student and checked his record, proceeding in this manner until all twenty had been covered. At no time did the observer go back within a five-minute period and make a second record for a student who had already been scrutinized within that period. The time was divided into twenty five-minute periods, and only one entry of a kind was made per subject per five-minute period. Twelve types of nervous habits were observed, these were grouped in four major categories. Occasionally a subject showed two simultaneous nervous habits of the same category, such as sucking a finger and the thumb at the same time. Such simultaneous manifestations occurred, however, in less than 1 percent of the records.