Given the following context:

The gang is driving through a desert in Roswell, New Mexico when a sandstorm forces Shaggy to make a wrong turn onto government property. Soon after, a UFO causes Shaggy to crash the car, and the gang find themselves on the outskirts of a small town. While Scooby and Shaggy stay with the van, Fred, Daphne, and Velma go to a local diner to ask for directions. Shaggy and Scooby then see a mythical animal called a jackalope , which takes their last Scooby Snack. Scooby and Shaggy chase the jackalope into a cave, where they encounter aliens. They flee the cave and run into the diner in a panic.
Scooby and Shaggy tell the people inside the diner about their encounter, but the gang is skeptical. The waitress, Dottie, says that multiple people claimed to have seen aliens, but that she has never seen them, but she has noticed strange lights and sounds at night. The chef, Sergio, says that a month earlier local cattle vanished without a trace, after which many people left town. A man named Lester, who claims to have been abducted, believes Scooby and Shaggy. He also claims to have pictures from his abduction; however, they turn out to be nothing more than paintings. He then tells the gang that ever since the installation of SALF (Search for Alien Life Forms, similar to SETI) satellite dishes, there have been numerous reports of UFO sightings and disappearing livestock.

answer the following question:

Who runs out of a cave and into a diner after seeing aliens? 

Shaggy