I don't know how they wrote this with a straight face. This was a real
memo sent out by IBM to its employees in all seriousness.
It went to all field engineers about a computer peripheral problem. The
author of this memo was quite genuine. The engineers rolled on the
floor!
Especially note the last couple of sentences.
"If a mouse fails to operate or should it perform erratically, it may
need a ball replacement. Mouse balls are now available as FRU (Field
Replacement Units). Because of the delicate nature of this procedure, a
replacement of mouse balls should only be attempted by properly trained
personnel.
Before proceeding, determine the type of mouse balls by examining the
underside of the mouse. Domestic balls will be larger and harder than
foreign balls.
Ball removal procedures differ depending upon the manufacturer of the
mouse. Foreign balls can be replaced using the pop off method. Domestic
balls are replaced by using the twist off method.
Mouse balls are not usually static sensitive. However, excessive
handling can result in sudden discharge.
Upon completion of ball replacement, the mouse may be used immediately.
It is recommended that each person have a pair of spare balls for
maintaining optimum customer satisfaction.
Any customer missing his balls should contact the local personnel in
charge of removing and replacing these necessary items.
Please keep in mind that a customer without properly working balls is an
unhappy customer."