Over hearing the voices of the doctor, the nurse and the wrestling coach with finny, geen begins to... what?

That would be laughing at himself, " It would never occur to Finny to say any of these things, but they struck me as so outrageous that I couldn’t stop myself from laughing. I put my hand over my mouth; then I tried to stop my mouth with my fist; if I couldn’t get control of this laughing they would hear me in the room. I was laughing so hard it hurt my stomach and I could feel my face getting more and more flushed; I dug my teeth into my fist to try to gain control and then I noticed that there were tears all over my hand."