Retrograde
Muse
Luis Alvarez' "jet effect" explanation and experiments are controversial among JFK conspiracy theorists because it's a piece of solid, reproducible evidence that there wasn't a shooter in front of the limo, hence Alvarez was a CIA plant and a shill.
Back in the good ole days of Usenet, there was a discussion of this on one of the groups. My all-time favorite True Believer statement: "What does this guy Alvarez know about physics anyway?".