When I was about 8 I had a really bad cold and I refused to blow my nose because I didnt like doing it.

My tubes, nasal passages and whatnot became filled with so much snot and gunk that my inner ear burst because of the pressure of all this stuff backlogging in my tubes. It hurt like blazes. I remember we were trying to watch a film as a family and I kept screaming in pain because it felt like someone was stabbing me in the head.
I think my inner ear burst in my sleep because when I woke up my ear was stuck to my pillow with yellow gunk and my pillow was covered in it. I had immense fun picking all the gunk off my ear, and it was good because my ear no longer hurt.

It taught me to always blow your nose when you have a cold.

Yum!