I made an 11-layer Igor Bar once to take to Dorkstock UK at Dragonmeet. It included bananas, mincemeat (the stuff in christmas mince pies), peanut butter, cherry jam, sour skittles, "rocket fuel" brand coffee powder mixed with glucose syrup, marzipan, and the whole thing was topped with green icing and multicoloured sprinkles. I believe it was described as "shoggoth-like" at one point. When John ate some he disappeared (turned out he'd gone outside and had bumped into some friends) and for a while my friend and I wer half-convinced that my Igor Bar had killed him.
We had so much left, we were eating it for weeks. It even started fermenting, there was that much sugar in it!