I was on the Grassy Knoll T-Shirt

Persistent Grassy Knoll theories stem also from studies of recorded police-radio transmissions, which contained sounds from Dealey Plaza in the moments during and after the assassination. The grassy knoll of Dealey Plaza is a small, sloping hill inside the plaza that became infamous following the assassination of John F. Kennedy. The knoll was above President Kennedy and to his right (west and north) during the assassination on November 22, 1963. Of the 104 Dealey Plaza ear witness reports published by the Commission and elsewhere, 56 recorded testimony that they remembered hearing at least one shot fired from the direction of the Depository or from near its Houston and Elm Streets intersection that was to the rear of the President, 35 witnesses recorded testimony of at least one shot fired from the direction of the grassy knoll or the triple underpass located to the right and front of the President, 8 witnesses gave statements of shots fired from elsewhere, and 5 earwitnesses testified that the shots were fired from two different directions.