Being a Virgo, I'm a huge fan of my birthday - aside from receiving well wishes, the largest icon of the birthday is the Birthday Cake. Since I've had just over 40 of these in my life, I have a pretty solid opinion on types of birthday cake, and also how to eat them.
My favorite Birthday Cake is Ice Cream Cake. Tom Carvel was my man from an early age. With a Carvel in my town, my birthday was not complete without a Carvel Ice Cream Cake. I do recall when I was small, that there was a light-colored row of crunchies in the middle layer, along with the chocolate crunchies. (anyone else remember that?) I'm not elitist when it comes to cakes, JP Licks does a good ice cream cake, and there's also the bi-sexual cake... the one layer of cake with one layer of ice cream together which is VERY naughty. I'm a big fan of bakery cakes as well, with a variety of frosting flavors - some that make your teeth ache, others that make you want to lick the plate clean.
My lovely and smart husband picked up a small triple layer bakery cake, golden cake with white frosting for my birthday. The frosting had a bit of an almond flair to it, almost undetectable but there. It was quite good - frosting sweet but not painful - perfect accompaniment to a small glass of milk. My dear co-poster Brian inscribed his drawing of the proper way to eat a piece of birthday cake in a card sent to me, which was the impetus to this posting.
Here's the way I would eat a triple layer (same general process for double layer) cake. It's all about proportion. Start with the most bland, lowest cake layer at the point, including the frosting row above it, working your way to the frosted end-cap. Move up each layer at a time in similar fashion. When you get to the top layer, eat the first part of the cake till you get about half way. Here are a few options:
a) use your fork and bisect the cake edge, so you are eating either the top frosting with a triangle wedge of cake, or the end-cap frosting with the triangular wedge of cake (as shown in the diagram).
b) eat both the top and end-cap in little blocks, so each bite has an "L" of frosting.
I tend to eat the B version, because it feels like i'm eating a lot of frosting - the big finish! I also do something similar with pies when i get to the crust.