The truck will probably crush you to death, the same way it would if it was loaded with oranges.

Hmm actually this particular truck will go slower than one full of oranges so you have a better chance of survival.

A few stray gamma rays - the quantities we can make at the moment are vanishingly small compared to macroscopic objects.

A picogram of antimatter carries about as much energy as a 90mph fastball. About 180 joules.

The energy released by an automobile collision is roughly 10 to 100 times that much.

Imagine you're in a car crash and someone throws a big rock at the side of your vehicle. Or you're driving and a bird hits the windshield. That's the sort of scale we're looking at here, it's really not catastrophic.

It would be terrible. But no more terrible than a FCL of shien crap.