In light of recent posts like Xrays from tape and RF from tornadoes, I submit to the CR4 community...the lasagna cell. 
From Amazing Ribs:
“An acid such as vinegar or tomato sauce and electrically charged atoms like salt form the electrolyte. Aluminum foil is one electrode, and the pan, often steel or different alloy of aluminum, is the second electrode. This causes the aluminum foil to pit and dissolve, and you shouldn’t ingest gravy filled with metal ions”.
So it can just as easily happen to a bowl of pulled pork or another dish.
Would Garfield still eat it?