Amy and Sheldon try to figure out what the supposedly "perfect gift" was that Leonard and Penny gave them on The Big Bang Theory. "The Wedding Gift Wormhole" is the second episode of the show's 12th season.
Penny: I'm a Sagittarius, which probably tells you way more than you need to know. Sheldon: Yes, it tells us that you participate in the mass cultural delusion that the sun's apparent position relative to arbitrarily defined constellations at the time of your birth somehow affects your personality. Penny: Participate in the what?