Just for pun!

Ok, I have seen them so many times, 'no pun inteded', 'pun intended', 'it is a metaphor for..' .... But, many people use them with only a vague (or without having the slightest, in some cases) idea of what the phrases mean.

Remember grammar classes as a kid? my teachers (like everyone else's I guess) were extremely particular about my/our understanding the terms. And this was one of them.

As the definition for a pun goes,

pun
A pun is a variety of a usually humorous play on words involving
a. the multiple meanings of an expression, or
b. two expressions that sound similar.

example:

your voice is bass

here, the word bass refers to the quality of the voice (low frequency). But, the word bass sounds exactly like (base which means disgusting, ignoble..). Hence, it is a pun - a double meaning word/phrase.

hope, this shall put an end to all those who err. yeah right!

For more:
http://en.wikipedia.org/wiki/Pun