"De Cock Fight" joke

The South Carolina State Police received reports of illegal cock fights being held out in the parish near Goose Creek, and duly dispatched Detective Thibideaux to investigate. Thibideaux reported to his sergeant the next morning.

"Dey is tree main groups in dis cock fightin," Thibideaux began.

"Good work Thibideaux! Who dey be?" the sergeant asked. Thibideaux replied confidently, "De Polacks, de Cajuns, and de Mafia."

Puzzled, the sergeant asked, "How you find dat out in one night?"

"Well," said Thibideaux, "I went down and done seed dat cock fight,I knowed de Polacks was involved whan a duck was entered in de fight."

The sergeant nodded. "Oh yeah, l see dat, but what' bout de others?"

Thibideaux intoned knowingly, "Well, I knowed de Cajuns was involved whan sumbody bet on de duck."

"Ah," sighed the sergeant. "Dat be making some sense. How you deduce dat de mafia be involved?"

"De duck, he won."