I developed a condition called Pectus Carinatum when I went through puberty. Basically it's when your chest sticks out further than it should. In my case it's the right side that's about a centimetre further out than the left. I was offered surgery at a younger age and declined, but I'm looking into it again. I'm hoping to have a brace put on, but surgery may be necessary due to it being asymmetrical.
But to answer the question, I've had my tonsils and adenoids surgically removed due to tonsillitis, I've had http://en.wikipedia.org/wiki/Tympanostomy_tube done, and I had a bowel biopsy for some or other reason (I was too young to remember, I just asked my mother).