Yes, that was what happend to a german reefer and his family. It was big in the media. However, he tried to free his rocks from a massive amount of green palys. After that, the aerosol produced by his skimmer sent him and his family to the hospital.
Other ways of poisoning I heard about: touching with a cut in your finger, zoanthid squirting the juice into your eye by fragging, dying colony (reason was broken heater overheating the tank) releasing toxin and harming the reefer trough the skimmer again