Clergy says on day one: hoy oh yoyo A==B.
Clergy says on day two: hoy oh yoyo B==C.
Clergy says on day three hoy oh yoyo A != C

Everyone leaves on day three unmoved. But one student in the mass comes back and says: "But Rabbi, what you've said contradicts itself".

The Rabbi says: Oy Vey, God has chosen this one for the profession of correcting things that are not correct. My lecture on trinity finally landed.