I know it's been done to death but....
Int. Nightschool classroom. A teacher is standing at the front facing the class. Behind him there is a blackboard with 'SIGN LANGUAGE CLUB' written on it in chalk.
The teacher signs*
Subtitle reads: "Welcome to Sign Language Club. The first rule of Sign Language Club is you do not talk about Sign Language Club."
Teacher looks stern and signs**
Subtitle reads: "The second rule of Sign Language Club is...You DO NOT talk about Sign Language Club..."
END
* actually signs: "I always hold my wife's hand when we go out together.
** actually signs: "It stops her talking and if I let go she goes shopping."