Why are people acting like this was some clever twist on a tired joke? Someone mentions portal, says they are getting a cake, and then said cake turns out to be a lie. That's it. The basic of the basic.
I'm slightly amazed there are people who actually didn't see this coming, except to say "Man, there is no way this author could be so unbelievably bad, I wonder what new thing they're going to do."
Really, I should be nicer though, this author is a hack, and I guess cake jokes are a bad gaming webcomic rite of passage.