SCP-504 is a species of tomato physically and genetically identical to that of the typical commercially-grown tomato. When a poor attempt at humor is made verbally within human hearing range of SCP-504's tomatoes, they instantly accelerate to a speed of at least 100 miles per hour (approx. 160 kilometers per hour, 45 meters per second) in the direction of the sound's source. The worse the joke is, the faster the speed of the tomato is.