Can a programmer become a tester ?

From: Ami Dash

A Really good one!! J

A university scholar, Mr. John Smith 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?