This morning in the subway I saw a sign that said
"Danger
People
Working
Above"

And, while I appreciate the effort of going from men to people (just think of what it would suggest to have a sign that said "Danger: Women working above," like "better watch those women when they get their hands on power tools!"), it made me wonder if perhaps it shouldn't be "persons" instead of "people." This, I guess, is the problem with intuitive grammar and/or the way American education approaches grammar and/or this is the reason I was never particularly successful with Spanish grammar.