"I've never had to knock on wood, but I know someone who has.

Which makes me wonder if I could.

It makes me wonder if I've never had to knock on wood.

And I'm glad I haven't yet because I'm sure it isn't good,

That's the impression that I get." - The Mighty Mighty Bosstones

I have, and it's not. At least I know that in the moment, I run towards the fire rather than away from it.