In school Mrs. Rogers was playing a word game with the kids.

She would shout out a letter and then pick on a student, and the student would pick a word that starts with the letter.

Mrs. Rogers said the letter "B" and Johnny raised his hand.

Since Mrs. Rogers thought he'd say bitch She called on Sam instead. Sam said Ball 

Mrs. Rogers said the letter "P", and Johnny raised his hand again.

Since Mrs. Rogers thought he'd say Pussy, she called on Cathy, who said paper. 

Finally, Mrs. Rogers said the letter "R", and again Johnny raised his hand.

Mrs. Rogers couldn't think of a bad word that started with "R" so she picked Johnny.

Johnny hesitated and said "Rat" .... "A Big Mother Fucking Rat"