Muhammad Ali's boxing gloves
Selling price: $1.1 million

Throw a charity into the mix, and a sports memorabilia auction can get out of hand in a hurry.

Just last year, casino owner and Ultimate Fighting Championship head Lorenzo Feritta celebrated Muhammad Ali's 70th birthday by dropping seven figures on a pair of gloves Ali used to defeat Floyd Patterson in 1965. That bid proved too much for Dallas Cowboys owner Jerry Jones, who offered $1 million for them the same night.

The auction was part of a gala to raise money for research to treat Alzheimer's, Huntington's, ALS, Multiple Sclerosis and Parkinson's syndrome, which Ali has suffered since 1984. The Greatest Of All Time hasn't fought in roughly 30 years, but demand for pieces of his legacy is just reaching its prime.

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