The doctor says "I'm sorry, we've run all of the tests, and it's really bad news. It's inoperable brain cancer."

The man is utterly stricken and heartbroken, and squats, head in his hands.

The doctor says "you know, since you really don't have a chance of living anyway, you might as well participate in this new experimental surgery we have. We can swap a new brain into your body."

The man says "Um...really?"

The doctor beams and waxes eloquent on his topic. "...yes, we even have three fresh brains today for you to choose from. The first option is the brain of an Episcopal."

"why would that make a difference?"

"Why, you'd be very smart, but you would never be entirely sure what you believed. That would be $500,000."

"Wow. Okay, what's my next option?"

"Next, we have the brain of a member of the Church of the Nazarene. It's only $300,000. You won't be as smart, but no matter what you believe, you'll always know that you're right."

"And what's my third option?"

"The brain of a Charasmatic. It's worth $1,000,000."

"Wow, why so expensive?"

"Because it's never been used."