This is Steve Martin at his best.
Dirty Rotten Scoundrels is one my favorite childhood comedies.
In this scene Steve Martin and Michael Caine work together to con a woman out of money.
Steve Martin plays "Ruprect", Caine's retard brother. The plan is to gross out the woman.
[Sitting at the dinner table]
Freddy Benson: Excuse me. May I go to the bathroom first?
Lawrence Jamieson: Of course you may.
Freddy Benson: [after a pause, and with relief] Thank you.