A pair of red ruby slippers worn by the actress Judy Garland while playing Dorothy in the classic 1939 movie The Wizard of Oz sold at auction for $28 million on Saturday. Heritage Auctions, based in Dallas, slapped a $3 million estimate on the slippers. Pre-sale bidding had taken the price up to $1.55 million before fierce phone bidding propelled it to $10 million within three minutes. After 15 minutes of drama, the gavel finally came down at the astonishing sum. With the auction house’s fee tagged on, the unknown buyer will pay a total $32.5 million for the sequinned...