story: Bob collects old model cars as a hobby. He told me he doesn't have a favorite but I'm not sure that's true. Yesterday I heard him talking with his friend on the phone about cars. Bob told his friend that a 57 Chevy was his favorite car. I wonder why Bob didn't want to tell me that.
 selected sentence: Yesterday I heard him talking with his friend on the phone about cars.
I eavesdrop >Causes/Enables> I hear Bob talking with a friend