A quick scroll through seven wonderfully nerdy Halloween costumes: escaped AI agents, fluid dynamics, the trolley problem, survivorship bias, OpenClaw, a secret key and the AI executive starter pack. Come for the costumes. Stay for the footnotes. Which one wins? This is a playful personal selection from supplied X screenshots, not a comprehensive ranking. The post captions are costume jokes, not confirmation of the scientific or security claims they reference. Screenshot credits, in order: Aashima Arora — @asharoraa Melissa Chen — @MsMelChen Linda Dong — @lindadong jasmine — @jasminecoded_ raghav srivastava — @raghavtheraghav OpenHack — @openhAck Apoorv — @apoorvardshan Edited with Framewright. Original photographs preserved; phone/cafe staging is AI-generated. English voice generated with ElevenLabs. Cafe ambience: “Cafe ambient sound.mp3” by evsecrets, CC0: https://freesound.org/people/evsecrets/sounds/332271/ #Halloween2026 #NerdCostumes #SanFrancisco