Dear Prudence,
My sister and I recently met for lunch. When she opened her purse to pay her share of the bill, I noticed she had her TV remote control in there. In response to my asking about it, she said it was her way of getting back at her husband when he does something stupid (in this case he neglected to take out the trash). She said he goes crazy looking for it, then she sneaks it back later. My BIL can be a dumbass sometimes, but this sort of gaslighting seems rather mean. Should I clue him in, or is it none of my business?
—Remote Revelation