Reject the wet

Genuine answer, cranberry agriculture involves a lot of spiders. To harvest the berries the farmer floods the bog that they grow in. You can just knock the berries loose and they float to the surface. However, a lot of spiders live in the bog (they're helpful for pest control too, so they are encouraged) and when you flood their bog they are flooded too. This means that they will seek anything dry to stand on, which is commonly going to be you if you are wading in to harvest cranberries.