Sentence 1: Kenny was going to dinner with his girlfriend. 
 Sentence 3: Kenny had to turn around to get his wallet 
 Sentence 4:  Kenny called his girlfriend to tell her he was running late 
 Sentence 5:  Kenny's girlfriend was made at him 
 Option 1: He had forgotten his wallet at home. 
 Option 2: When the check came, Kenny realized he'd forgotten his wallet and his girlfriend happily paid for dinner.