A single spider? Not an infestation of them ? I would consider the risk of infection from other humans in the restaurant hugely more significant. Should we all be seeking compensation every time someone sneezes? I highly doubt a single spider is a reflection of cleanliness . We do live on a planet with the odd other animal and they do have a tendency to appear on occasion. Indeed I saw a mouse in the new klm lounge at the weekend. Apparently we are all never more than 3 meters from a rodent and then there are the bugs we all have in our mattresses !