tbh some of these examples of so called over-indulgence are pretty poor. Last Christmas I had to buy a second pack of marzipan and one of icing for the cake coz I ate the originals - just as they were, subtely carving away at them until I reached the half-way point when I gave up on the pretence that they were still all there, resigned myself to a return trip to the supermarket and just polished off the lot.
When I was a kid and my mum had baked a cake I would remove the entire top layer, put it on one side, get a knife, remove great swathes of butter icing, then replace the top. By the time we got to the end of the cake there wouldn't be any butter icing left and I'm amazed no-one sussed.