Because it's not technically a proper loop-de-loop roller coaster. It's a spinning one, where you sit in a circular shaped vehicle, 2 people facing one way and 2 the other. You spin, and drop, and you bounce against the sides I think. It used to be a ride called Spinball Whizzer, but they're now re-branding it to be a Sonic ride called Sonic Spinball.
Oh, the MOA has one of those! It's fun, one of my fave rides. Though, the bouncing can get uncomfortable sometimes.