Hillary takes a seat and notices this wall covered with clocks. She also notices that every now and then, different clocks jump 15 minutes ahead of time. 

When St. Peter returns, Hillary says, "What's with all the clocks?" 

St. Peter replies, "Well, each clock represents a man back on Earth." 

Hillary asks, "Why is it that some of the clocks skip ahead 15 minutes?" 

"Every time a clock skips, that means that a man has committed adultery," answers St. Peter. 

"Which one is my husband's clock?" inquires Hillary. 

"God has that one in his office," answers St. Peter, "He uses it as a fan."