Where do churches come up with their catchy slogans?

You know the ones I mean. You see them outside every church in America. “There are some questions that can’t be answered by google.” “Walmart is not the only saving place.” “For protection, use son block.” I saw countless hilarious ones while driving from Philadelphia to Maine last weekend….I should have written them down but I didn’t and can’t remember any. So, is there a large book that they pull these out of? Do the church goers all contribute one into a hat? Do they sit around a table and confer? Serious question.