Indeed ~~ the most common at present is the repeated name of the Chelsea manager Jose Mourinho to the LDEM tune.

I heard a story once [hope this hasn't already appeared above ~~ if so, apologies] that when Rigoletto was first in rehearsal, Verdi called a meeting of the entire opera house staff from director to cleaners & scene shifters, and begged them all to be careful not to whistle La Donn' e Mobile as they went about the streets, or it would be sure to catch on & he would be accused of plagiarism when the first night eventually came.

~M~