Portal fans will get the joke. All of them. Those passing you in the street, those sitting across from you in the room. They'll all be ready to read your t-shirt and tip you the wink. Or a high-five.
They've all been there, portal shooter in hand, being promised cake and grief counseling at the end of this. Grief counseling?! And then you find out and, oh dear... you need your support group at times like this.
Help yourself to find them with 'the cake is a lie' merchandise. You will know your people afterwards.