"Great Machines" joke

A traveling salesman checked into a futuristic motel. Realizing he needed a haircut
before his next day's meeting, he called down to the desk clerk and asked if there
was a barber on the premises.
"I'm afraid not, sir," the clerk told him, "but down the hall is a special machine that
should serve your purposes."
Skeptical but intrigued, the salesman located the appropriate machine, inserted fifty
cents, and stuck his head in the opening, at which time the machine started to buzz
and whirl. Fifteen seconds later the salesman pulled out his head and surveyed his
head in the mirror, which reflected the best haircut he ever received in his life.
Down the hall was another machine with a sign that read, "Manicures - 25 cents."
"Why not?" thought the salesman. He paid the money, inserted his hands into the
slot, and pulled them out perfectly manicured.
The next machine had a huge sign that read, "This Machine Provides What Men Need
Most When Away from Their Wives - cost 50 cents."
The salesman was embarrassed and looked both ways. Seeing nobody around he put
in fifty cents, then unzipped his pants and stuck his "thing" into the opening - with
great anticipation, since he had been away from his wife for two weeks.
When the machine started buzzing, the guy let out a shriek of agony. Fifteen seconds
later it shut off and, with trembling hands, the salesman was able to withdraw his
"thingy"...
Which now had a button sewed on the tip.