Judah: I shagged a prostitute, not realising it was my daughter-in-law!
"Judah gets in all sorts of trouble with his daughter in law"
Genesis 38 King James Version 11 Then said Judah to Tamar his daughter in law, Remain a widow at thy father's house, till Shelah my son be grown: for he said, Lest peradventure he die also, as his brethren did....