The brown meat that Stan saved for the apocalypse
Idk if I'm late in saying, but I was watching the episode Boyz Crazy and I forgot that it shows Stan stocking up on the brown meat for the apocalypse, which we see in the Finale. Here's a link to the screen shot
http://gravityfalls.wikia.com/wiki/Boyz_Crazy/Gallery?file=S1e17_stocking_up_for_apocalypse.png
(Idk if it's going to work or not)