Sample bias. If you put shaving cream all over the gloves, and tell a person to remove them without coming to contact with the shaving cream, they usually do co

Sample bias. If you put shaving cream all over the gloves, and tell a person to remove them without coming to contact with the shaving cream, they usually do contact the shaving cream (which represents bacteria). Most people will not intuitively remove gloves in a hygienic manner. While this can be solved with education, the gloves without the education is false protection.