an old snake goes to see his doctor. "doc, i need something
for my eyes, i can't see very 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, but i just discovered i've been living
with a water hose (软管）the past 2 years!"
