How Do You React to Unintended Puns?

A work colleague and I were discussing a company he used to work for in the nineties. Part of the company was sold.

August 12, 2011
He described it this way: “[Company name omitted to prevent slander charges] bought the satellite business and drove it into the ground.”

As usual, I didn't laugh even though I thought it was pretty funny, because my colleague didn't notice that he had made a pun. I wanted to say something like "Did they drive the business into the ground because they kept driving satellites into the ground?" but I was afraid he wouldn't get my comment, or he would get my comment, and think I was making fun of him. You know, the usual reactions when you try to expand on the enjoyment of an Unintended Pun.

Have you come up with any non-offensive ways to further the enjoyment when you make or hear an Unintended Pun? Let us know here at Baring My Sole.