A teacher had heard that some 1st graders were saying "you suck" on the playground and the teachers wanted to stop the kids from saying that.

So one day on recess duty a teacher thought she heard a little boy say it and asked a little girl,

"what did that little boy just say" and the little girl replied.."I can't say, I don't want to get in trouble.

The teacher said "you can tell me and you won't get in trouble" and the little girl replied yet again..."I can't say, it's a very bad word and I don't want to tell you."

To that the teacher replied, "please tell me what the little boy said, you WILL NOT get into trouble."

So then the little girl said......."well, it rhymes with f*ck".