the waking up line to end them all...

So, I'm finishing dinner, eating a piece of the cake my grandmother sent us and watching Torchwood with my sister(she's tapping into all of my addictions she can get her hands on lately, it's very annoying) and(presumably) my mother.
Me: Which one of you is encouraging her to keep on making this kind of cake?! It's like it's not finished, like something's missing... It's like--
My mother who'd been, unnoticed by us nodding off for the last fifteen minutes wakes up suddenly: A truncated cone?
Me and my sister: O.o....! *desperately trying not to fall off our chairs with laughter, breaking the tv's remote control in the process :/*
My mother: *blinking confusedly* ...and the Christmas tree?

*headdesks*