Crime has been a little low in Metropolis so Superman is flying around
looking for something to do.  He decides to visit the Batcave to see if
Batman wants to hang out.
"Hey Batman," Superman says, "You want to go hang out, you know...maybe
shoot some hoops or have a few beers?"
"Sorry Superman," Batman replies, "the Batmobile isn't working and
Alfred's on vacation...I can't go."
"That's alright, I guess I can find something else to do." Says
Superman.
So Superman goes flying off again, in search of something to do to pass
the time.  As he flies, he sees Spiderman's house and decides to pay him
a visit.
"Hey Spidey...Are you free now?  I don't have anything to do right now so
I was thinking maybe we could get a beer, shoot some hoops, or something?"
Asks Superman.
"Sorry Superman, I got my webslingers all messed up last night and I
need them to fight crime so I probably will be fixing them all day."
"Okay," says Superman, "I"ll see you tomorrow then."
By this time, Superman is pretty depressed so he's flying back to his
place when all of a sudden, he notices a woman on top of a building,
completely nude lying on her back and spread eagle.  Not having any
urgent duties, Superman wonders to himself, "You know, I am faster than a
speeding bullet.  I bet I could go down there, get a little action, and
be back up here before she knew what hit her!"  Without thinking another
minute, Superman zipps down, does his business, and flies back up within
a few seconds satisfied with the way the day turned out.
On the top of the building, all of a sudden Wonder Woman says
"What in the hell was that?"
"I don't know" replies the Invisible Man, "But my arse HURTS LIKE
HELL!!"