I get that Peck. My wife and I kid with each other in the same way, knowing that we're kidding. When the addressee is not familiar with the speaker, however, the message itself becomes at the least indeterminable, and left to a multitude of interpretations (which is why I would never make such a joke in public). Which is why you shouldn't take my mentioning that single element as isolated. Instead, my take-away has been built on a number of experiences taken together. Given clearer context within which the addressee sits, an indeterminate statement becomes less indeterminate. This is pretty much Roman Jakobson's scheme of language comprehension verbatim. Language doesn't exist in a vacuum, and it doesn't exist as an essence. Speakers, listeners, contexts, all work fluidly. So don't isolate that individual instance so much, but consider it as belonging to number of variables, which have, apparently, in my case led to a certain tendency.