The first person to back a weird idea is what turns one strange kid into a movement.

A single person with an unusual idea is easy to dismiss and easy to laugh at. Two people is a different situation entirely, because the second one proves the first was not simply odd. That second position is the one that costs something and the one that changes the outcome.

When somebody says something unusual and the room goes quiet, be the one who says it is interesting and asks a question. You do not have to agree with it. Making it safe to have the idea is a separate act from endorsing it.