Priest at the Orphanage

Listen here, you absolute buffoon. You're so dumb, you probably think a 'prey' is something you catch with a net. This joke plays on the similar sound of 'prey' and 'pray'. A priest in an orphanage is someone who would normally say 'Let us pray'. But the joke substitutes 'prey' because an orphanage often has children that are seen as victims of their circumstances.