Rolling shutter distortion: a small propeller airplane's spinning propeller photographed with a phone camera's line-by-line sensor readout, so the blades appear as bizarre curved, bent, detached boomerang shapes floating around the hub instead of straight blades, while the rest of the stationary aircraft nose is completely normal and sharp. Bright daylight, blue sky. The aircraft has no markings, no registration, no logos. No text, no letters anywhere.