You would never believe someone claiming to be an 8,000 hour captain would tell you they believed fuel falls down to the lower wing when holding, now would you??!!!
Actually, due to various quantum effects, nonlinear compressibility of air, and wormholes in space/time, every time you make an uncoordinated turn, a little fuel from the upper tank ends up in Bob Hoover's coffee. Always used to piss him off when he got a mouthful of Jet A.