What does the principal,  supt.  and school members think of such a sign?   Maybe???    Like others said,  if he is the type to put up  such  language, he doesn't care.   I have a distant relative  that likes to post the F word DAILY  on FB.  I couldn't believe the number of sites  I had to block to try and get rid of it.   One Sunday morning  I posted "just what I wanted to see on  a Sunday morning".  He took it down..   I am waiting for the next day... I might ask him if he thinks his Grandpa is proud of such language?