Doctor de leche (aka dulce de pepper, #23, or the mcQueen)
it works as follows, in 2 fashions;
1:1 (in a blender, mix) dulce de leche ice cream, dr.pepper, and ice, blend until as thick as a wendy's frostee.
float a big scoop of the dulce de leche in a large cup of dr.pepper
the taste is (not very surprisingly) rich as hell, but has an interesting if not almost complex aftertaste.
for maximum artery clogging potency, drink with a crust cake.