Be careful using superlatives when describing things in your campaign world. Because you can guarantee that if you describe a villain as the "most evil person in the world", then once he's been defeated and locked in prison, the PCs will challenge any other claimants to the title as exaggerating.

(Of course this is when you apply Joker Immunity and the Cardboard Prison, and let loose with the original bad guy again! So all is not lost. As long as you're willing to unleash the most evil person in the world on the world again. But hey, you're the GM, that's your job.)

Transcript

Captain Antilles: {dead} Hey everyone. Guess what! My character is three and a half pages of pure awesome. I'm ready to roll!
R2-D2: Judgement withheld until evidence is produced.
GM: Jim's devised an... interesting back-story. I'm all set to introduce his new character this session.
GM: The hovercar arrives at an overlook giving you a magnificent panoramic view of the desert all around, and in the valley far below you the cosmopolitan bustle of...
GM: Mos Eisley Spaceport!
Obi-Wan: You will never find a more wretched hive of scum and villainy.
R2-D2: I thought that place where Anakin lived was the hive of scum and villainy?
GM: All of the Mos'es are wretched hives of scum and villainy. It's just that Eisley is the most wretched.
C-3PO: Or that the ones that are even more wretched are so well-hidden that we'll never find them.
GM: It's the most scummy too. Also, villainous.
Captain Antilles: {dead} The ideal place to meet a new friend!
Obi-Wan: We must be cautious.