Witness: (at a lineup) She could be #2
but she also looks like #3
Munch: Too bad you weren't at the grassy knoll.
The grassy knoll refers to a site near the 1963 John F. Kennedy assassination, it is a small hill in Dealey Plaza, Dallas, Texas. Many eyewitnesses were on the knoll overlooking the presidential cavalcade when the shots were fired, some of whom claimed the sounds came from the knoll, not the depository, fueling conspiracy theorists for decades to come.