@scmeaux :

Humor is definitely a good way to have students focused and engaged in the class. It can make a relatively boring topic  very interesting and appealing . It makes the whole classroom experience fun and enjoyable and that makes the student more relaxed and not stressed.But too much of anything is not good. The instructor must have the proper timing and and must use good humor to be effective and acceptable. Students want to participate and will feel not intimidated in class discussions and recitations.