Chad is in a room with Adam. Suddenly, Beth enters. There is an awkward silence; Chad can sense that these two have history together. What does Chad do? Does he quietly sneak out of the room? Does he dismiss himself by saying "I'll leave you two alone"? No, he tells them his mother is calling, despite the fact that nobody else can hear his phone ring. This trope is when a character (or characters) feel the need to leave the room, so he/she/they come up with an excuse only a gullible fool would believe. Used in the Boy Meets World episode "City Slackers", when Shawn throws his book outside, claiming he dropped it and needs Cory to help him look for it.
Hello, Unkown Troper. You'll need to get known to lend a hand here.
Three days must pass before this YKTTW is Launchworthy or Discardable