Medical coincidence

My 3 year old boy was running around with a wooden drumstick in his mouth (despite frequent admonishments....). He inevitably hit the wall with it on his mouth and came crying to me. I told him off and thought no more about it. That was about 10am. By 12 am he was refusing to eat, spitting out his saliva rather than swallowing it and was running a high temperature. I immediately thought he must have got a splinter from the drumstick in his mouth that was getting infected or swollen. Cue trips to GP, and then on deterioration that evening, to A&E. Neither the GP nor the A&E doctor could see any signs of soft tissue trauma, but were sufficiently concerned by his state that he was about to be kept in overnight. Then the paediatrician arrived, who diagnosed him from a meter away by the smell of his breath, and confirmed on inspection a vicious dose of tonsillitis. 5 days of antibiotics later, he is as right as rain, and now tells other children off - 'Don't run with things in your mouth - you'll get tonsillitis!'. Coincidence not causation - but doctors are trained (rightly) not to believe in coincidences...