Might have posted this previously, it happened about 3 years ago.
I knew a 10 yr old kid (not one of mine) who feigned abdominal pain as a means of getting out of school.
The GP didn't take any chances, and sent him straight to A&E with suspected appendicitis. A&E booked a theatre for an emergency appendectomy.
It was only when consent forms and a surgical gown were provided that the rather scared lad whispered to his mum "I was only pretending"
That wasn't the end of it. The doctors thought he might be saying that just through fear of surgery. They couldn't be sure if his appendix had just ruptured or not, so he was kept in all day for bloods and other observations, and they only let him go home that evening on the strict condition that he return the next morning for a further assessment.
I can only imagine how relieved, mortified and utterly furious his parents must have been. He's probably still grounded now.