This joke is a bit on the naughty side.  Reader beware!

It's the eve of Yom Kippur and Rebecca is standing up in her shul's women's balcony chanting aloud, in Hebrew of course, a key prayer of repentance - "Ashamnu, Bogadnu, Gozalnu, Dibarnu-dofie ................". And while she is chanting, she's beating herself with a clenched fist on every word she utters. But instead of beating herself on her breast, as all the women around her, and all the men on the ground floor are doing, Rebecca is beating herself on her pubis.

Her friend next to her sees her doing this and whispers to Rebecca, "Becky, you're not supposed to be hitting yourself there. You're supposed to hit yourself here."

Becky replies, "Please Rachel, please leave me alone. I know what I'm doing. I'm beating myself where I sin the most!"

Yom Kippur: Jewish festival - The Day of Atonement
shul: synagogue
Ashamnu, Bogadnu, Gozalnu, Dibarnu-dofie, ......: We have trespassed, we have dealt treacherously, we have robbed, we have spoken slander, .........(these are the first of 24)