A student reported that she parked her vehicle on Ferst Drive near the Student Center and began walking along Ferst Drive towards the library. She realized that she had forgotten something in her vehicle and walked back. When she entered her vehicle, she did not notice that an unknown male was in the rear seat. He struck the back of her head with his hand and pulled on a lanyard hanging from her neck. He then made a reference towards the student's purse. The student sprayed pepper spray at the male and he exited the vehicle headed in an unknown direction with the student's property. The student received minor injuries but did not require medical attention.