Good one

Software Testing - A good read....not intended against any group as
such, but still entertaining ... read on ...

A university scholar, Mr. John Smith(not a real name)  approaches his friend a
software-testing guru telling him that he has a Bachelor in programming,
and now would like to learn the software testing to complete his
knowledge and to find a job as a software tester. After summing him up
for a few minutes, the software-testing guru told him "I seriously doubt
that you are ready to study software testing. It's the serious topic. If
you wish however I am willing to examine you in logic, and if you pass
the test I will help teach you software testing. "

The young man agrees.
Software testing guru holds up two fingers "Two men come down a chimney.
One comes with a clean face and the other comes out with a dirty face.
Which one washes his face?

The young man stares at the software-testing guru. "Is that a test in
Logic?" software testing guru nods.
"The one with the dirty face washes his face," He answers wearily.

"Wrong. The one with the clean face washes his face. Examine the simple
logic. The one with the dirty face looks at the one with the clean face
and thinks his face is clean. The one with the clean face looks at the
one with the dirty face and thinks his face is dirty. So; the one with
the clean face washes his face."

"Very clever" Says Smith.  "Give me another test"

The software-testing guru again holds up two fingers "Two men come down
a chimney.One comes out with a clean face and the other comes out with a
dirty face. Which one washes his face?

"We have already established that. The one with the clean face washes
his face"

"Wrong. Each one washes his face. Examine the simple logic. The one with
the dirty face looks at the one with the clean face and thinks his face
is clean. The one with the clean face looks at the one with the dirty
face and thinks his face is dirty. So; the one with the clean face
washes his face. When the one with the dirty face sees the one with the
clean face washing his face, he also washes his face. So each one washes
his face"

"I didn't think of that!" Says Smith. " It's shocking to me that I could
make an error in logic. Test me again!."

The software-testing guru holds up two fingers "Two men come down a
chimney.One comes out with a clean face and the other comes out with a
dirty face. Which one washes his face?

"Each one washes his face"

"Wrong. Neither one washes his face. Examine the simple logic. The one
with the dirty face looks at the one with the clean face and thinks his
face is clean. The one with the clean face looks at the one with the
dirty face and thinks his face is dirty. But when the one with clean
face sees that the one with the dirty face doesn't wash his face, he
also doesn't wash his face So neither one washes his face".

Smith is desperate. "I am qualified to study software testing. Please
give me one more test"

He groans when the software-testing guru lifts his two fingers, "Two men
come down a chimney. One comes out with a clean face and the other comes
out with a dirty face. Which one washes his face?

"Neither one washes his face"

"Wrong. Do you now see, John, why programming knowledge is an
insufficient basis for studying the software testing? Tell me, how is it
possible for two men to come down the same chimney, and for one to come
out with a clean face and the other with a dirty face? Don't you see?