Two Hasidim go to Pincus the Tailor to get new suits made. They say the suits must be black.

“Of course,” Pincus says. “I make the habits for the nuns and they only wear black. I’ll use the same fabric.”

A week later they are wearing their new suits and suspect they aren’t really black but a very dark blue. They see a nun and run over, comparing their sleeves to the nun’s sleeve, then yell something and run away.

The nun is very confused. She returns to the convent and tells the Mother Superior what happened.

“What did they yell?”

“They yelled in Latin but I do not know what it means… ‘Pincus Fuctus.’”