[waterhouse]

> It's presumptuous to imply that one knows what someone else is thinking.

I agree and sympathize. But incidentally, the original use of that phrase was not so presumptuous. In case you (or anyone reading this) don't know, the original quote is from the movie "The Princess Bride", where one character repeatedly says that some possible event would be "inconceivable" and then that event happens--he also exclaims that some events that have just happened are "Inconceivable!". Another character tells him, "You keep using that word. I do not think it means what you think it means." It's "don't think it means", not "doesn't mean": this contains a proper amount of uncertainty for being a deduction about someone's likely thoughts based on observation of their actions.

And, as a matter of fact, cynicalkane's comment was similar: "I don't think [thing] means what you think it means." Also he didn't include an adaptation of the "You keep using that word" part--I would have found that irritating, being an excessive use of movie references that would make nonsensical writing if the movie didn't exist--but cynicalkane's comment flows naturally, and I consider it a proper use of the phrase. I can only assume that you have seen a bunch of other comments using the presumptuous form (if we want to be grumpy old men, we might say "perversion") of the quote, and cynicalkane's comment was similar enough that you thought of the other comments and decided to complain here. (I haven't actually seen the presumptuous form myself, though I'm willing to believe you've seen it enough to be irritated--and a quick google suggests it does have a large presence. I'd probably be annoyed too.)