Hmmm, it could be the 63 pound king salmon on the wall that I caught in Alaska 20 years ago ...
or the collection of 40 Matchbox cars/trucks that I had as a kid that are displayed in a shadowbox on the wall. (They cost 39 cents each when I was 10-12, now they're worth about $3,500. for the collection) ....
.... but the the absolute "Best" thing is my Red Sox DVD that captures their recent playoff and World Series wins from 3 years ago. The World Series against the Cards was anti-climactic, but I just never get tired of watching the Sox beat the Yankees 4 straight to get to the series after being down 0-3 in the American League Championship .... priceless!