What is a humorous scene in Much Ado About Nothing Shakespeare?

I need to write an essay on What Much Ado About Nothing teaches me about realtionships and I need to include reference to at least 1 humorous scene and 1 serious scene. My thesis is that all relationships must be built on trust. I used the wedding scene where Claudio accuses Hero of being unfaithful to him as my serious scene and said that mistrust can lead to disasters and chaotic situations. But what can I do as my humorous scene that has something to do with Mistrust in realtionships. I need answers ASAP please this essay is due very very soon and I am very very stuck!