A little on the SCP itself:

Item #: SCP-504

Object Class: Safe

Special Containment Procedures: All seeds, plants, fruit, crossbreeds, and other products of SCP-504 are to be classified as SCP-504. SCP-504 seeds need no special containment, other than to prevent misuse by unauthorized personnel. Grown SCP-504 plants and their fruit should be kept in soundproof rooms. Guards and researchers assigned to maturing or growing SCP-504 are to be equipped with radio-enabled masks which insulate non-transmitted sound, and are to be instructed to avoid attempts at humor.

Description: SCP-504 is a species of tomato physically and genetically identical to that of the typical commercially-grown tomato. It was recovered in [REDACTED], Kentucky after a woman reported to the police that her farmer husband had been "murdered by his lunch". The Foundation is currently working to identify and destroy loose strains of SCP-504 in the surrounding commercial farming areas.

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.Only mature tomatoes, separated from their vines and less than 10% rotted or chemically compromised, exhibit this effect once each.