Little Johnny - Name!!

Little Johnny was walking down the hallway at school.  

When he reaches his classroom he looks inside and sees a sub instead of his regular teacher.  

Johnny sits down and the teacher says, "Now students, my name is Ms. Prussy. 

Not the other word, this word has an r after the first letter." Johnny started laughing.  

An hour later he forgot her name and said, "Your name has an r after the first letter is it Ms. Crunt?"