unstaple the piece of paper from the receipt.    From Wordnet, Princeton University. 

It did terrify me having to unstaple the issue to scan it though!.    From Wordnik.com.  [PCW – Personal Computer World Magazine – 30 Years Old « Official Harry Harrison News Blog] Reference

Like other unstaple commodities, the value of which depends upon their scarcity or abundance, it never has assumed a constant and standing value, but its price has generally been deranged by speculation and monopoly.    From Wordnik.com.  [The Commercial Products of the Vegetable Kingdom Considered in Their Various Uses to Man and in Their Relation to the Arts and Manufactures; Forming a Practical Treatise & Handbook of Reference for the Colonist, Manufacturer, Merchant, and Consumer, on the Cultivation, Preparation for Shipment, and Commercial Value, &c. of the Various Substances Obtained From Trees and Plants, Entering into the Husbandry of Tropical and Sub-tropical Regions, &c.] Reference

"He had, in fact, gone out of his way to staple things incorrectly just so he could prevail on his teacher to unstaple them, giving him another glimpse of the blood-chilling mandibles in action." by Neal Stephenson. meme howto.    From Wordnik.com.  [Mike's Planet] Reference

Caution: slituation the unstaple!.    From Wordnik.com.  [Status Clitical | Engrish.com] Reference