What does Taylor Swift have in common with a group of improv comedians pretending to be wizards? They can both sell out Madison Square Garden (… and also, their fans kind of hate Ticketmaster now).

Dropout’s Dungeons & Dragons actual play show, Dimension 20, is getting pretty close to selling out a 19,000-seat venue just hours after ticket sales opened to the general public. To the uninitiated, it may seem absurd to go to a massive sports arena and watch people play D&D. As one Redditor commented, “This boggles my mind. When I was playing D&D in the early eighties, I would have never believed that there was a future where people would watch live D&D at Madison Square Garden. It’s incomprehensible to me.”