The Rogue Wolf said:
That Guy. Because then you'd confuse your arch-enemy.
"Dark Blackness, sir! That Guy is here- he plans on thwarting your evil scheme!"
"That guy? What guy? The guy with the briefcase?"
"No, sir! That Guy! Your arch-nemesis!"
"I have a lot of arch-nemeses, I'm a supervillain! Be more specific!"
"That Guy, sir! He does... the thing!"
"The thing? You're not talking about Dish Man, who can keep six dishes spinning on stick at once?"
"No sir! ...though that was pretty impressive, I hope he invades again soon. But that's not-"
This goes on for half an hour, until the bomb you planted destroys the evil lair.
That is a very funny scenario and, depending on how smart the villain is, I'm sure it would work, but I got a few more names that could also fit the situation...
Its ("Its here!" "What's here?" "Its here, Sir!" "What's here?")
The Booze ("Sir! The Booze is here!" "Really? well we have been working hard. I guess I deserve a break" "No Sir, The Booze! The Booze!" "Alright, Alright... you can have a glass too, but only one as someone must remain clear headed").
The Postman ("Sir! The Postman is here!" "Wonderful! I hope he has the copy of Bioshock II I ordered, and when I say ordered I mean taken at gun point" "No sir! It's The Postman!" "Right, now go sign for it, I would like to see if it's better then the original")
After all the confusion, the villains base would still end up being blown up by an explosive you had planted earlier