A snake's new glasses

A old snake goes to see his Doctor.

"Doc, I need something for my eyes...can't see well these days".
The Doc fixes him up with a pair of glasses and tells him to return in 2 weeks. The snake comes back in 2 weeks and tells the doctor he's very depressed.

Doc says, "What's the problem...didn't the glasses help you?"

"The glasses are fine doc, I just discovered I've been living with a water hose the past 2 years!"