In a small Jewish community, there was a problem: should people stand or sit when reciting the prayers? Every time they got to the prayers, half the people stood and the other half sat.
The ones standing would shout, “Stand up! Stand up!”
The ones sitting would shout, “Sit down! Sit down!”
And the prayer would always end in chaos and argument.
Realizing they couldn’t go on like this, they went to a great rabbi and asked him, “Are we supposed to stand or sit during the Kaddish?”
The rabbi looked into the sources and authorities, and ruled: “There’s no biblical requirement—it depends on the custom of your community.”
“But how can we know what the community's tradition was?” they asked.
“Ask one of the founders of your community,” the rabbi replied. “See what they did back then.”
So the congregation found a 90-year-old man, one of the original members of the community who no longer came to services, and they sent a delegation from both sides to ask him.
“Are we supposed to stand?” asked the standers.
“No!” said the old man. “That was not the community tradition!”
The sitters beamed. “So we’re supposed to sit?”
“No!” the old man answered again. “That wasn’t the custom either!”
“So what is the custom?” the delegation asked.
“Well,” said the old man, “what’s happening now is that half of you stand, half of you sit, the standers yell ‘Stand up! Stand up!’, the sitters yell ‘Sit down! Sit down!’, and the prayer ends in a mess and a big fight!”
His face lit up. “THAT is our custom!"