10. Ben Stiller - Spock's Ears (Star Trek: The Motion Picture)
Of all the actors you'd expect to be a Trekkie, Ben Stiller probably isn't one of them, and yet, Stiller has outed himself in recent years as not just a Trekkie but an avid collector of Star Trek memorabilia.
In addition to owning the original Gorn head from the iconic Original Series episode "Arena" - which he bought at auction for $27,500 - Stiller owns not one but two pairs of Vulcan ears worn by late Spock actor Leonard Nimoy.
Stiller first bought a pair worn by Nimoy during TOS' second season and even featured them in his movie Tropic Thunder, as visible on Matthew McConaughey's character's desk.
According to Stiller, this caught the attention of Nimoy himself, who then sent Stiller an additional pair of ears, even signed by the actor, which he had worn while filming Star Trek: The Motion Picture.
Stiller famously made a crack about owning Vulcan ears during his memorable presentation of the Best Makeup Oscar at the 2010 Academy Awards, but it was more than a mere throwaway joke - he truly owns one of the most coveted pieces of sci-fi memorabilia ever, direct from the source no less.