Bort - 2015-10-04 There is a way to not laugh, but I don't recommend it because it means being a wet blanket: remember that Michael Palin's character can't help his speech defect and his feelings would be hurt if he realized people were making fun of him.
StanleyPain - 2008-11-27 Great Palin scene. It's amazing he pulled it off as well as he did considering the infamous trouble he admits he has with keeping a straight face during stuff like this.
Also, not really a dupe. This is the official channel version of this scene which means better quality and it won't get taken down.