I watch a lot of strange Internet videos, and it’s hard to shock me with web-based weirdness. But leave it to an elementary school chorus from Racine, Wisc., to do just that. “Christmas Trololo” (a choral arraignment of the “Trololo” song) is hilarious, terrifying, amazing, and baffling. It starts strange — why are the kids in masks? why are some of those masks scary? — and then segues into audience participation, which is just magical. Also, the moment at 1:35 is a mindfrak on par with Inception wrapped in a Kafka novel on an acid trip. Well done, Gifford Children’s Choir!

Your move, PS 22….