Marshall tries to downplay that he got mugged at gun point while crossing through Central Park on his way home from work. Robin gives him a gun so that he will feel safe. Later at the bar, Lily tells the gang she is applying for a gun license because she believes it will make her feel safer. Marshall does not think it's a good idea. Meanwhile Barney has been promoting the advantages of a good lie, as depicted in various flashbacks. Lily is so worried about Marshall that he tells the gang "what really happened." He stopped at the Central Park Zoo on the way home to look at the monkeys. He got too close to the cage and the monkey grabbed him by the lapel and took his wallet out of his breast pocket. Robin has been desperate for an interesting interview for the show so she asks Marshall to come on and tell the story of his "monkey mugging". While doing the interview with Robin he admits during commercial break that he was not mugged by a monkey, but just said so so Lily would not pursue buying a gun. Robin doesn't care if it is true, she needs him to tell the story as she really needs a good interview; but she can't go through with it in the end. Robin has to put Ted on the show to talk about his Empire State Building reproduction that he's been begging her to have him on about. We never find out how Marshall really lost his wallet, but Lily did not get a gun and Robin maintained her journalistic integrity.