The sound comes from the FX comedy series What We Do in the Shadows, which premiered in 2019 and follows vampire housemates on Staten Island. Matt Berry plays Laszlo Cravensworth, while the Baron is the ancient and feared vampire Baron Afanas. Fans clipped Laszlo cautiously calling for him and shared the moment online as a reaction sound. Its popularity comes from Berry's unmistakable delivery and the universal joke of calling into darkness for someone important, which keeps it useful far beyond the original scene.