A man goes to see a doctor who is an eye specialist, and walks in to see him carrying this violin case under his arm.

"What can I do for you?" asks the doctor.

"I'd like you to take a look at this", the man says.

He opens the case to reveal the biggest smelliest turd the doctor has ever laid eyes on.

"I did that!" the guy tells the doctor.

"Right, well, err, shouldn't you be going to see your normal doctor about that?" asks the doctor, "After all I am an eye specialist and I don't see how I can help you with that!" the doctor goes on.

"No, you don't understand", says the man, "Every time I do one of those it burns so bad it makes my eyes water!!"