Avoid a letter

One of the players has the task to avoid a certain, predefined letter when speaking on stage. If he/she nevertheless pronounces it, he will be "punished", e. g. by being replaced with another player.

Example: The letter "s" is forbidden.

*A:"Darling, cinema today"?
*B:"What will be the name of the film?"
*A:" Titanic."
*B:"Do you already have one ticket and another one?"
*A: "Yeah, got it on the day before today."