Like any language, English is full of homonyms, which leads to - besides confusion in ESL Class - plays on words. The pun is derided by certain dour persons as the lowest form of humor (though certainly crass deserves that ignominious title). Others, such as my colleague and friend DM, take much pleasure in a good (and indeed, often in a lame) pun. What should we make of this lingual device? It is my opinion that the intent of the teller and the situation in which the telling happens determines the effect of a pun.
Puns become groaners for two reasons: 1) it's horribly constructed, or 2) the person sharing his gem of wit appears to be doing so to please his ego. When you get the feeling that the other person is simply flaunting his wit for our benefit, it hardly leaves one in a position to enjoy the pun. Pride ruins more than your standing with God, folks. Of course, it is possible to receive the impression of a self-centered pun when it is not at all intended that way. It happens.
Naturally, the timing of the pun is also important. Comic timing is an art that I don't pretend to know a lot about, but I can sense when it's not the right time to crack a joke. Better than I used to, at least. The same goes for puns.
Also, I believe that accidental puns can be some of the most enjoyable. What better way for a person to distance himself from his joke so that everyone can enjoy it in its purest form?
I may return to this post and revise for concision, but until thin, you'll have to diet. That would be an accidental pun, actually...
(And Patience really is an opera. Not making that up.)
