Today is Boxing Day in the UK and Commonwealth countries like Canada and Australia. Accounts of its origin vary, but according to the World Almanac Encyclopedia, "Traditionally, on that day the gentry would give presents, generally of money, to servants, tradespeople, and others of humble life."

Most of us in the U.S. don't celebrate Boxing Day, but December 26 does represent another Christmas tradition: returning unwanted gifts. In 2005, December 26 was the 4th busiest shopping day of the year. According to the National Retail Federation, more than one in three consumers (37.6 percent) will return or exchange at least one gift. And the majority of gift givers (56.9 percent) are including receipts to make returns easier. Click here to get the NRF's advice on making returns easier after everything's been unwrapped. Or hit the jump to see what won't be returned—in the NRF's lists of the most popular toys of 2006.