Why the hell (excuse my enthusiasm) does a lesson have to be boring when you can teach grammar using jokes and unbelievably the only thing you have to do is a click away.
ESLJokes.net offers us ready-made lesson for teachers and for students. The jokes are graded as elementary, pre-intermediate, intermediate and upper intermediate/advanced and they cover lots of grammar points from present simple to reported speech.

If you are student, you can use them for autonomous learning because it also provides the answers to the exercises and if you are a teacher, then this is just pure heaven! Everything done for you!
I’m planning to use the one about the Penguin (please, see Intermediate) to teach reported speech and I’m sure my students will be glad to have reported speech introduced in this way. Wouldn’t you if you were a student?