Upon reaching 65, Bob decided to retire.  After having him under foot for a few months, his wife became very agitated with him.  She suggested he go and do something to occupy his time, like join a club or get a hobby.  Bob obliged and went out for a couple of hours. 

When he got home his wife asked about his day and he replied, "Oh, I just went down to the park and hung out with the guys.  And oh yeah, I joined a parachute club. 

"What?  Are you nuts?  You're 65 years old and you're going to start jumping out of airplanes?" 

"Yeah, look I even got a membership card." 

"You crazy old man, where's your glasses!  This is a membership to a Prostitute Club, not a Parachute Club!" 

"Oh, great!  Now what am I going to do?  I signed up for 5 jumps a week!"