If you're curious, maybe you can look into Chuck's lawsuit against Penguin's book of Chuck Norris facts. He would eventually "co-author" his own book. The obvious guess here is trademark infringement (over use of Chuck's name/likeness) and/or copyright (if some of these facts were lifted from his book).
Interesting. I get the likeness thing, but surely one could publish jokes about anyone they wish and that would be satire or fair use or something?
Facts and copyright is an interesting one, because I'm surprised a fact can be copyrighted, unless it's the wording specifically.