Not famous really--but familiar to Bradbury, uh, scholars, I suppose. I thought that Bradbury is so much part of the mainstream that the phrase might ring a bell. It's a quote from Juan Ramon Jimenez that Bradbury quotes as the opening quote into Farenheit 451--so please forgive my crediting that quote with fame. I made a quick and careless assumption that was overblown. Very sorry here, bel'

The entire line is: If they give you ruled paper, write the other way.

That caught my fancy and I wondered how others here might complete the opening subordinate clause.