Superman does a backflip in the air like a huge show offy jerk. Why?

Flying is awesome that's why.

"A few times!" Superman says, picturing a classic Luthor Lair under some subway with busts of famous east Asian dictators and collected philosophy of madmen he's turned into a mathematical formula for crime. Ah, nostalgia. "Spent some time here undercover after an earthquake, Will Magnus was worried it was artificially created. Found this great dim sum place, I wonder if it's still open..."