Soldier Ant 

Why did someone bring an umbrella to Dealey Plaza that day in 1963?

Imagine this. There's a man, on this bright sunny day, standing on the sidewalk right where the President is about to pass, who opens an umbrella. Not only that, but (as seen in the Zapruder film) he rotates the open umbrella while he's standing under it, as if somehow tracking the President with it as the limo approaches. Now the man pumps the umbrella up and down, as if signaling, right after JFK is first shot. Not only that, but there's a slim, dark-complected man standing on the sidewalk near the umbrella man who, after JFK has been hit, raises one hand high in the air. And after more shots have been fired, fatally wounding the President, and while everyone else is running about or fearfully lying low on the plaza grass, the man with the umbrella calmly lowers and closes it. Then he and the dark-complected man, with chaos all around them, casually sit down together on the curb. Based on blurry still photos of the pair, the dark-complected man may possibly speak into a radio, then conceal it in his back when he and the umbrella man, having taken their respite on the curb, stroll away in opposite directions.

Update 12/10/2007: Changed link to Internet Archive version, since the original page seems to have gone away. Also added some tags to entry.