Snake's Water Hose

An old snake goes to see his Doctor. "Doc, I need something for my eyes, I can't see very well these days." The Doctor 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. The doctor replies, "What's the problem? Didn't the glasses help you?" "The glasses are fine, Doc, but I just discovered I've been living with a water hose the past 2 years!"