Sorry, link in Spanish only.
A female passenger on board flight IB 6316, an A340 doing the the flight from San José ( Costa Rica ) to Madrid, was stung by a scorpion during the flight. The aircraft was sealed upon arrival and disinfected. The passenger was fine after the medical attention provided in a Hospital of Madrid... but this will be probably the most painful and unpleasant flight of her life.... Certainly not a good experience !!!