He was simply reading a book, waiting for his friend to finish shopping for groceries.
Then a stranger opened the passenger door of his car at about 8:20 p.m. Tuesday in the parking lot of the Dillons at Central and West Street, pulled out a knife and demanded money from him, police said.
He then ordered the victim to drive to an ATM across the street in the 3900 block of West Central. The victim withdrew about $100 and gave it to the robber.
The suspect then ordered the victim to drive back to the grocery store, police said. The suspect then climbed into a Crown Victoria and left the area.
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The 24-year-old victim called police and gave "a very good description" of the suspect and the Crown Victoria, police Lt. Doug Nolte said.
A patrol officer spotted the car about 15 minutes later near Broadway and Murdock. The man and woman inside, both 45, were taken downtown for questioning and then booked into jail on suspicion of aggravated robbery.
"This is not something that typically happens," Nolte said.
The victim didn't really do anything wrong, he said, but police encourage people to lock the doors if they're going to be waiting in a vehicle for any length of time.
"It just underscores the need for people to be very aware of their surroundings," Nolte said.