Lay your cards on the table

The girls and I enjoyed a night out to dinner and a movie with my best friend Buffy.  We were enjoying the bread sticks at Olive Garden when Riley reached over and stuck her breadstick in Buffy's marinara sauce.  I told her not to do that, to put the sauce on her plate and she said that Buffy had let her, so...  "Look at her, playing the 'But Buffy let me do it' card," Buffy laughed.  Riley giggled and said "I like playing that card."