Any potential game show answer that involves Uranus is going to be funny.
Watching "Who Wants To Be A Millionaire" often leaves you with a lot of questions (namely, "This show is still on television?!") but it can also leave you laughing. This time, though, the laughs have far more to do with the answer than the question.
In all fairness, we think this might have been an honest mistake. How it didn't end up on the cutting-room floor is beyond us.
Check the blooper out for yourself below.