When you put a candle on a cake, and hold the candle and attempt to eat it, it duplicates the candle, and leaves the cake. Me and my friends did this and you can duplicate it without eating the cake up to 2 and a half stacks. This could be very abusive and probably needs fixed.
(I currently do not have images, but when I get any, I will send them in the thread.)
Duplicates MC-203568