Sentence 1: We went to dinner at the IHOP. 
 Sentence 3: IHOP said short stack pancakes cost only $1 if we had green 
 Sentence 4:  My wife and I both had green shirts on 
 Sentence 5:  Dinner was fun that night 
 Option 1: It was Saint Patrick's Day. 
 Option 2: It was Valentine's Day.