Lyndon put out the lie that he was riding in the third car in the motorcade and when the shooting started, SS agent Rufus Youngblood jumped on top of him to shield him. Nice story, but a lie. Senator Yarborough was in the seat next to LBJ, said it was extremely tight back there and Youngblood never climbed over the front seat to jump on top of LBJ, who had oddly ducked down several seconds before the shooting started in Dallas.
One of the most interesting “motorcade liars” was a famous LBJ aide named Jack Valenti.
He changed his story about which car he was in multiple times.
Some JFK assassination researchers believe he was one of the shooters—and was not in the motorcade at all—but was on the Grassy Knoll.