When someone tells a joke, the object or butt may not be present, or even a real person. Piss-taking is like the stand-up comic joke, in that both have a butt and an audience, in some cases these being one and the same.

To save these settings as a preset, click the Add button in the lower-left corner of the dialog and give the preset a name.

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Despite already being aware, he is acting out the pretence of a surprise.