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http://commons.wikimedia.org/wiki/File:US_$2_obverse.jpg

As a prank, Apple co-founder Steve Wozniak sometimes buys uncut sheets of $2 bills from the U.S. Treasury and has them bound into booklets. Then, when buying small items, he’ll pull out a booklet and cut off a few bills with scissors.

This is perfectly legal, but it’s caused at least one alarmed inquiry by the Secret Service.