You go through life secretly liking Trek while everyone around you either doesn't know about the show or have heard of it and think it's some kind of nerdy thing from the past. Or they think there's something wrong with you for liking a terribly made show in their opinion.
Then you meet a stranger who likes Trek and wants to talk about it.
You jump over a railing, flail your arms in the air, and land with both feet, then with a serious look point at them ..... and ask which series do they like the most.
Somewhat related, I was in a company Christmas party, got hot and removed my ugly sweater (for the ugly sweater competition, of course), revealing my Weyland-Yutani tee-shirt. A coworker immediately pointed at it “Ooh, Weyland-Yutani!” then grabbed his wife while pointing and they both showed me their matching Alien Xenomorph tattoos. Fun all around.