Ugh! Swallowing spiders! That's so gross! Actually I saw something the other day on TV, I think it was in Cambodia, but people were eating fried tarantulas like french fries.
spiders can be quite small. you'll have a hatch in your room at least once a year. some will crawl into your mouth. also while biking or in the car wit the windows open. it can happen at any time. who knows, you may be eating one right now...