We Will Rock You I used that one already... Also One Vision twice.

Jack smiles slightly. "Sometimes, but I'm not that big as a whole bird, and I'm too heavy to fly if I keep my size. So usually I only flit about the rooftops with people who can already fly, although I know a few hidden, private places legs can reach as easily as birds. You OK with heights? And, uh, not too wobbly?" There's a whole code to the sky-people's language, and Jack knows it.