According to Wikipedia, The Key lime (Citrus aurantifolia) “is a citrus species with a globose fruit, 2.5–5 cm in diameter (1–2 in), that is yellow when ripe but usually picked green commercially. It is smaller, seedier, has a higher acidity, a stronger aroma, and a thinner rind than that of the Persian lime.”
According to Alan Sailer, an English photographer, a key lime is a projectile.
He uses other projectiles too.
He made his own flash and works out of his garage.
via Boing Boing