According to Wikipedia Humour occurs when:
+ An alternative (or surprising) shift in perception or answer is given that still shows relevance and can explain a situation.
+ Sudden relief occurs from a tense situation. "Humourific" as formerly applied in comedy referred to the interpretation of the sublime and the ridiculous, a relation also known as bathos. In this context, humour is often a subjective experience as it depends on a special mood or perspective from its audience to be effective.
+ Two ideas or things are juxtaposed that are very distant in meaning emotionally or conceptually, that is, having a significant incongruity.
+ We laugh at something that points out another's errors, lack of intelligence, or unfortunate circumstances; granting a sense of superiority.These are some pieces that will help you keep positive in difficult situations. An accent piece such as one of these are sure to inject a little fun into anyone's home.
Woodson & Rummerfield's House of Design