"Hm?  Ah.  You see, for decades I have researched my magics, built strongholds, crushed resistance, dealt with meddling kids - I think this is the first time in fifty years that I'm raiding something else's stronghold!"  He broke into a baritone cackle, which only faded slightly when he noticed that the ponies weren't laughing with him.  He didn't need their approval; it was still funny to him.