Thanks to Cousin Debbie for this joke:

A Jewish couple is sitting together on an airplane flying to The Far East.
Suddenly, over the public address system, the Captain announces,
"Ladies and Gentlemen, I am afraid I have some very bad news. Our engines
have ceased functioning and this plane will be going down. Luckily, I
see
an uncharted island below us that should be able to accommodate our
landing. However, the odds are that we will never be rescued and will
have
to live on the island for the rest of our lives."
A few minutes later the plane lands safely on the island. Morris turns
to his wife and asks, "Esther, did we pay our pledge to the yeshiva
yet?"
"No, Morris," she responds.
Morris smiles and then asks, "Esther, did we pay our
UJA pledge?"
"Oy, no! I haven't sent the check," she says.
Now Morris laughs out loud. "One last thing, Esther.
Did you remember to send our Temple Building Fund check this month?"
"Oy, Morris, I haven't sent that one, either." says Esther.
Now, Morris is practically choking with laughter. Esther asks
Morris,
"So? What are you smiling and laughing about?"
Morris answers confidently,
"They'll find us."