That's the very nature of farce. A few years back I went to see Just Go With It, the romantic farce with Jennifer Aniston, Adam Sandler, and (my personal reason for going) Nicole Kidman. (It's a remake of the old Butterflies Are Free film from the late '60s or early '70s with Walter Matthau, Ingrid Bergman, and Goldie Hawn.) It's based on the comic notion that a dentist (a bachelor) asks his long-time nurse to pretend to be his wife, so as to make his girlfriend think he's unavailable for marriage but still attractive; and she agrees, and complications ensue. Several times during this romp I noticed we came to a plot point where anybody would say, as you did, "Okay, hold on --" And each time, the screenwriter added an event which gave the focus character some kind of motivation to continue with the (absurd, to us) behavior.
Ah, heck, any film with Jen Aniston and Nicole "Aphrodite" Kidman competing in a hula contest is worth seeing at least once.
