Pros:  Funny for people who get the joke
Cons:  Secret games are frustrating to some

This is a secret group game.  One person (who knows the secret) will 
start repeatedly asking the players:

"My mother's dead, is she dead?"

The answer is either yes or no.  Those that know the secret, know
the answer, and can start answering properly.  The game continues
until everyone figures it out.

The game moves along better if at least one other person knows
the secret and can correctly guess the answer.

The secret is below:





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It will seem like the asker is asking the same question each time,
but he/she is not.  The questions and proper answers are:

"Okay, my mother's dead, is she dead?"              "Yes"
"My mother's dead, is she dead?"                    "No"

You will be surprised at how many people filter out the "Okay" and
will look for some other clue, to the point where you will be saying:

"***OKAY***,...  my mother's dead, is she dead?"

And they still won't get it, because confusion will have ensued!