In 2021, the odds a young man would have a confirmed case of pericarditis (ONLY peri-, not myocarditis) following a Moderna mRNA jab were over 1 in 1000 - and really closer to 1 in 500...
The official rate was 53.5 cases per 100,000 doses, but remember a "vaccination" (which lasts, oh, about four months due to waning efficacy) takes two doses, so that works out to 53.5 per 50,000 vaccinations