Quick! Check the attic and raid your parents' basement — these playthings from your past are worth a small fortune now.

2) 1978 Luke Skywalker Action Figure: $25,000

When Nigo, the Japanese designer and founder of A Bathing Ape, decided to offload his Star Wars collection, he turned to Sotheby's. The total haul of the 2015 auction came to over half a million dollars, and included this as-new boxed Luke Skywalker figurine, one of only 20 out there.

5) The Original Monopoly Game: $146,500

An original hand drawn oil cloth version of Monopoly made in 1933 and owned by the game's inventor Charles Darrow sold for $146,500 at Sotheby's auction house in 2011, nearly double its expected price. But, even if you don't have such a rare version of this beloved game, vintage versions from the 1930s have sold for $3,125 and limited editions sell for hundreds on eBay.