If someone you know
is an anti-vaxxer conspiracy nut, then use the russell's teapot on them
And remind them it is not our job to disprove their wild claims, it is their job to prove them (and that goes beyond the usual "my sisters father-in -law's best friend's 2nd cousin's daughter once felt better after waving a crystal over her head" proof offered)
On 2nd thought.. just hit them with the teapot