h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Place food in one hand, or on table if unable to handle wrap with food in one hand.
Pull out enough wrap to cover one dimension of food and then some.
Place food against wrap and proceed to cover food with wrap without tearing off wrap.
Hold wrap taut throughout process to prevent it from turning into unwieldy mess.
When food is satisfactorily covered, tear off wrap.
This method may use more wrap than stricly necessary, but it neatly prevents the 'turning into unwieldy mess'-property of plastic food wrap from manifesting.