But I have yet to begin to shenanigan! And I shall shenanigan again and again! 
World's Finest (Volume 3) #6 is an issue of the series World's Finest (Volume 3) with a cover date of September, 1999.
Synopsis for "Year Six: The Imp-Possible Dream"
Mr. Mxyzptlk is in Metropolis and he meets up with Bat-Mite. The two imps argue over who is better, Superman or Batman, and the two decide to prove which one is best. Bruce Wayne is visiting Clark Kent at the Daily Planet, when suddenly, time stops except for Wayne and Kent. Bat-Mite and Mxyzptlk appear and vanish Kent and Wayne's civilian clothing, replacing it with their respective costumes. The two imps tell the heroes about their wager and tell them once a winner is declared they will restore reality. Batman and Superman race to save Lois Lane and both arrive at the same time. Next, the imps put the heroes in a fun house maze. The first to find his way out, wins the contest. The heroes find the exit at the same time. Mxyzptlk becomes frustrated, says his name backwards and disappears. Reality is restored and Kent sees Wayne off.
Appearing in "Year Six: The Imp-Possible Dream"
Featured Characters:
Supporting Characters:
Antagonists:
- Mr. Mxyzptlk
- Joe Chill (As an illusion only)
- Octo-Birds (As an illusion only)
Other Characters:
Locations:
- Krypton (As an illusion only)
- Metropolis
Items:
- Batarang (As an illusion only)
- Giant Typewriter (As an illusion only)
Vehicles:
- Helicopter
Notes
- This issue is reprinted in Batman & Superman: World's Finest and World's Funnest.
Trivia
- Continuity error: Here Mxyzptlk knows Superman's secret identity, and the Man of Steel himself doesn't seem nervous about such a situation. Mxyzptlk has actually known the secret identity for years, but Superman only discovered that the imp had this information in Superman: The Wedding Album #1.
- On page 12, a square pays homage to Superman #76, where Superman and Batman met for the first time.
- On page 17, Mxyzptlk's magic turns Robin's uniform into an uniform wore by Earth-Two Robin.
See Also
Recommended Reading
World's Finest Vol 1 World's Finest Vol 2