Well, if you believe the Warren Commission, you believe Lee Oswald was on the Second Floor a mere 90 seconds after firing the shots that killed President Kennedy up from the Sixth Floor.
But while he was in custody, Oswald made these claims:
1. He went to lunch in the Domino Room on the First Floor at noon.
2. He went up to the Second Floor lunchroom and bought a Coke.
3. He was on the First Floor when the President passed the building.
Claim 1 comes with a precise location—the Domino Room—and is supported by other testimony.
Claim 2 comes with a precise location—the Second Floor lunchroom—and is supported by another person's recollection.
Claim 3 comes without any precise location—just the First Floor.