Silly frosty god. You have so much to learn of human traditions. Mobius just happens to really enjoy them. Hell, if it weren't for him, the TVA wouldn't even have a single twinkling light up this time of year. The tree in the main area is there because it was confiscated once by Mobius on some chalked up charges.
"They used to say you had to pick a berry before you could kiss someone. And if there's no berries, then you shouldn't kiss. But not kissing is bad luck." Ever the historian, Mobius goes on. "I think your people or those adjacent said it's a sign of friendship or love?"