The War of the Simpsons - S2-E20
Corrected entry: After Marge explains why they're having the party, Homer recalls their wedding very vividly, having, "priests, champagne, and musicians," but in Season 3, "I Married Marge," their wedding isn't that spectacular as Homer remembers.
Correction: Homer is an idiot, and his memory is not too good either.
SexyIrishLeprechaun