Yichud – Can you make up a mirsus?
Can you tell the babysitter you gave the key to the neighbor to walk in whenever they want, even though you did not?
Can you have fake security cameras?
Can you tell your wife that you are in the city, even though you are not? (Also, do you need to tell her that you left the city)
It is controversial, however numerous poskim allow it, based on the rationale, that it is the fear that is what makes the heter here, and if that is indeed in place and real, that it does work.