One of my favorite logic jokes:
Which is better -- eternal happiness or a ham sandwich?
A ham sandwich, of course. Why?
Well, nothing is better than eternal happiness, and a ham sandwich is certainly better than nothing ... so, a ham sandwich is better than eternal happiness.
I stole this fair and square from Raymond Smullyan's book. What is the Name of this Book: The Riddle of Dracula and Other Logical Puzzles. This is an incredilby fun book that will certainly test and hone your logical construction skills. It's been out of print for probably a billion years, but you may want to check it out of the library. And, Dad, if you're reading this, yes this is the book I purloined from your library about 20 years ago! And, yes, it does seem so wrong to talk about things I'd done 20 years ago -- sheesh! -- when did I get this old?