[murphy214]

Unless they accidentally hit a vein and inject the vaccine directly into the bloodstream, anecdotal evidence[0] points to this for young men who get myocarditis. They often report tasting saline in their mouth shortly after the injection.

[0] - https://www.youtube.com/watch?v=H7inaTiDKaU

[phonypc]

The age and sex disparity in post-vac myocarditis would seem to disqualify that hypothesis. It's not like young men have veins in their deltoids where other demographics don't.

Tasting saline after an IV injection in nonsensical.

[murphy214]

?

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2806387/

EDIT: Young people, specifically men are also more likely to get myocarditis in the general population irregardless

What makes you think the percentage of inter-vascular injections causing myocarditis should be distributed evenly across a population?

[marton78]

What would be the mechanism leading to tasting saline in the mouth?

[smileypete]

Metallic taste - adjuvant? (just a guess...)