This a a great article on humour in the classroom. Rieger (2014) points out that students are not always focused when they come to class for various reasons and perhaps asking a strange question out of the blue can perk them up. For example he describes asking a few questions which are relevant to the discussion and then popping in an irrelevant one, such as “which of you owns a motorcycle?” Telling jokes (as long as you know the punchline and don’t laugh at your own joke), especially in reference to what you are teaching may go a long way to reinforcing a concept.
Rieger, A. (March 13, 3014). Energize your Classroom with Humour. Faculty Focus. Retrieved from: http://www.facultyfocus.com/articles/effective-teaching-strategies/energize-classroom-humor/