Human beings really want to have lunch with Warren Buffett. Late Friday, with a few hours left to make a bid, someone offered more than $4.5 million in a charity auction for the opportunity to dine with the famed investor. That’s quite a bit more than anyone would bid to have lunch with me. I am fairly sure a lunch with me would fetch, at most, three dollars. And that’s if I’m paying the bill.

This “Power Lunch with Warren Buffett” benefits Glide, “an organization that offers free meals, health care and other services to homeless and low-income people in San Francisco,” the Journal’s Nicole Friedman reported this week. Glide was a favorite charity of Mr. Buffett’s first wife, the late Susie Buffett, and over the years, Power Lunches with Warren have raised close to $30 million.

This sounds like a genuinely good act, for a good cause.

Still, I have questions. Chiefly: how the heck is a $4.5 million lunch with Warren Buffett supposed to go?

Do you start with small talk, or is that risky? Say you begin with a polite icebreaker, something harmless. You ask Warren about the weather in Omaha. What if Warren talks about the weather in Omaha for 45 minutes? Omaha had a big hailstorm the other day. What if Mr. Buffett is really excited to talk about the hailstorm—he’s going on about cumulonimbus clouds and unstable air masses—and you look up at the clock, and you’re almost out of time?