“Never make light of the king, even in your thoughts. And don’t make fun of the powerful, even in your own bedroom. For a little bird might deliver your message and tell them what you said.”  (Ecclesiastes 10:2)

Here is a funny, but good example:

https://www.youtube.com/watch?v=0b9rOji_PWY&index=6&list=PLykzf464sU9-uj2DvWN3k3S6k_EPDw9pN