In September 2021, Kevin Tuckman, a 48-year-old sales manager, was doing a demo for a potential client in Foster City when he started having difficulty talking. "I would want to say something, and some words came out, but others I couldn't say," Tuckman said. After he dropped his pen five times within a one-minute period, Tuckman's colleague, Melissa Jackson, asked him if he was OK. Eventually, Jackson said: "You aren't OK, we need to take you to the hospital."