I'm going to take a different spin on this and pick out some of the funniest athletes. I'm sure I'm leaving a bunch out, so feel free to add. These are in no particular order.
The Yankee great was a classic. He came up with some of baseball's most memorable quotes. Here's an example: "Baseball is ninety percent mental. The other half is physical."
Another guy with the gift of gab. Here's one of Ali's: "Frazier is so ugly that he should donate his face to the U.S. Bureau of Wildlife."
Anyone that talks in the third person as much as Rickey is hilarious to me. Here is one of Rickey's keepers: "This is Rickey calling on behalf of Rickey. Rickey wants to play baseball."
The guy simply doesn't have an edit button. His mouth occasionally gets him into trouble, but you have to love his honesty.
The Big Aristotle almost always wears a great big smile and delivers some great lines. You can just tell he is fun. Went a little over the top with his question to Kobe, but he's delivered enough over the years to forgive him.
Was surprisingly funny on SNL, plus he's a bigtime practical joker.
If you have ever heard him on the Dan Patrick radio show, you'll know what I'm talking about. Reggie Alawishus Miller is a funny cat.
The Crown Prince of Baseball. Enough said.
Although, I use the word "athlete" loosely with him.
Honorable Mention: Mike Tyson
If he wasn't such a train wreck (and scary, for that matter), he might crack the list.