Went to bed with a headache, woke up intermittently during the night to find it still there, and got up in the morning with the same headache or one very similar to it. So I took an aspirin, which stuck in my throat, as pills usually do. I figured it would slide down along with my breakfast. The headache receded after a cup of caffeine solution and I forgot about my pill.
After more than five hours, during which I had no trouble eating or breathing, I coughed the pill up, unchanged. Where was it in the interim!? Can most people swallow pills without nibbling them to gravel, as I usually have to?