This guy goes to the doctor and says to him, "Doctor, I don't know what's wrong with me but every time I fart it sounds like the word 'Honda'."
"That's interesting. Never heard of anything like that before. Do you think you could fart for me?" says the doctor.
The guy says, "Sure." He farts and sure enough the doctor hears, "Honda."
After several attempts to figure out what's wrong with this guy the doctor runs out of ideas. He sends him to all sorts of stomach specialists and none of them can figure out why this guy's farts say, "Honda." It is a completely out-of-this-world medical condition.
Finally, as a last resort the doctors think they should send the man to a dentist.
After explaining the problem to the dentist, the dentist opens up the guy's mouth and examines it.
The dentist says "A-ha! I have solved the problem."
The patient says "What is it? What is it? Please tell me doc."
The dentist replies "Well, sir, you have an abscess tooth."
The guy says "Yeah. So what has that got to do with my farts?"
The dentist replies, "Can't you see? Abscess makes the fart go 'Honda'."