It's not knife-related, but my wife and I were sitting in front of the White House with a bunch of the VietNam Veterans Against the War, protesting the war in VietNam. It was the night of June 16, 1972, and we had an unmarked AMC Matador pull up and park on Pennsylvania Avenue, right in front of the White House, not once but twice, and the police out front never asked them to move as they so abruptly ordered anyone else to do. The regulars all alugherd and said to smile for the FBI cameras the first time, so we did. The second time was just after midnight, so it was the early hours of June 17. There were about five of us and perhaps 12 or so visible DC police, Park Police, and Uniformed Secret Service standing around wathching us when the two FBI agents drove up znd parked. This time, they go out and produced a huge Press Graphic camera, the type that Jerry Olsen always used in the old Superman movies and the type that they always used to use to take class pictures in school. You remember them, they had huge 8x10 inch plates that the photographer would put into the back, just like they use on X-Ray machines. At any rate, the FBI agents produced one of these and began to take pictures. I turned to my wife and said, "Happy Fifth Anniversary" and gave her a great big kiss just as they took a picture. So, somewhere in the FBI files, there is a picture of my wife and me, kissing on our fifth wedding anniversary.
But there is more to the story. Just after that, my wife got peeved with the obvious harrassment of us exercising our First Amendment rights and started lecturing the police about there being so many of them there while there were "rapists on the streets and burglars in the homes". It turned out that she was more right than she knew, because at that same moment there were a bunch of "Plumbers" from Nixon's Committee to Re-elect the President busy in the Democratic Headquarters offices in the Watergate Hotel while G. Gordon Liddy and James McCord were across the street in the Howard Johnson Motel keeping a lookout for the police. They missed the police when they pulled up because there were no uniformed police available to answer the call from Watergate Security, so they had sent some vice squad guys over in an very unmarked car and in plain clothes. That is how the burglars in the Watergate were caught, beginning the unraveling of Nixon's Presidency. Georgia and I like to think it was because they had so many police watching inoffensive protestors sitting in front of the White House.