Since no one else has suggested it ...
Gather your class together. Have each student sit in front of hir computer.
Have them open a sealed envelope.
And remove the install disk for LINUX.
Problem solved.
(My alternative solution involves a shotgun. Your choice ... issue one to each member of the class, have them shoot computer, or keep it for yourself, for use when one of your fresh-faced students asks "why do they call it a mouse?" "http means 'hit the page' doesn't it?" "what time is lunch?")
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