I think some slow motion of a box of caltrops being dropped out of a speeding van or truck would look pretty cool. Once the cargo is released, the van or truck could skid out of control and disintagrate. This is because a caltrop bounced off the front grill of a truck and ricocheted back into the van strikeing the neck of the driver.
Another action packed scene would be the use of caltrops as an act of revenge of a practicle joke. Here, a mad man is trying to get back at one person and an entire parking lot of cars get flat tires. The mad man is seen to slink away as if pretending it was a simple mistake. A close up of the caltrop deflating tires might be in store.
In this one, someone finds a caltrop and it leads to a mystery.