Two persons of an unmistakeable but undisclosed social, ethnic, or gender group walk into a bar.

The third person, being of a different social, ethnic, or gender group, ducks.

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A person of no particular gender, ethnic, or social group is riding a motorcycle. The shirt on this person's back reads, and I quote, "If you can read this, then the person who was riding behind me, whose value as a companion I am ambivalent about, has fallen off somewhere along the way."

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A person who speaks a second language with an accent which gives away that person's primary language, says something in the second language which is ambiguous due to the aforementioned accent, and can be taken sexually while not meant that way by the person uttering it, in such a place or at such a time that a sexual utterance is socially embarassing.

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This is too hard.

Why do kilts fasten with safety pins? Because sheep can hear a zipper from a mile away.

Alex