I was unwell today and it made me feel very grumpy. Consequently I was short tempered with a few people around me. I then considered the possibility that when other people have been grumpy with me it might have been because they were not feeling well at the time. This led to the idea that if someone is being grumpy with me it might be nothing to do with me at all and I shouldn't take it personally. I decided to see other people's behaviour in a new light in future.
I wondered why it's taken me so long to work this one out.
I have no idea what to do in my book for this one, but I guess I'll think of something.