Evidence that may potentially be cited as conflicting with the law of diminishing marginal utility would comprise: (i) Della’s enthusiasm for all-you-can-eat buffet diminishes subsequent to her fifth plate of lasagna. (ii) Jethro trades in his 1981 Gremlin on the 2006 Acura. (iii) Natasha tells Boris that she means to end their relationship. (iv) Engelbert would instead be promoted than acquire a big increase. (v) Melba enjoys her 10th vodka of the night much more than her second.