I work as an English teacher in a private school and sometimes I tend to use humour while explaining difficult points to pupils or let them ask "funny questions" ,in other words, queries that aren't serious enough to be uttered (likely to excite laughter) but could really trouble the pupils' mind. I thought that humour was a clever way to attract their attention and make the lesson less boring. And it worked! The pupils loved it! However, my superiors don't want to hear pupils laughing; they want me to teach English in a more serious tone. Ultimately, I'm going to comply with their suggestions but deep inside I don't want to; I thought that using humour at times was a positive thing.

I don't use humour at the expense of the learning process.
I do take pains to present and explain the material accurately and in detail. I just use it as a means to facilitate and/or reinforce knowledge.