Bacon might actually make a pretty good absorber, if you had enough of it. And kept the room cold. Cooked bacon, OTOH, would last longer but probably work worse than egg cartons.
BTW, I have a pdf here (sorry, don't remember where I got it) that documents a serious (ASTM Standard Test Method for Sound Absorption and Sound Absorption Coefficients) test of egg cartons as acoustical treatments.
They found that egg cartons had an absorption coefficent of 0.82 at 5 KHz, meaning that 82% of the energy was absorbed. That's not bad. In fact it's not much worse than 1" Auralex panels. Unfortunately, below 5 KHz absorption fell off rapidly, and had essentially no effect below 500 Hz. The NRC rating (average of coefficents at 250, 500, 1000 and 2000 Hz) was 0.05, about the same absorption as an unpainted brick wall. It would take 10 layers of egg cartons to equal even a 1" Auralex panel's wimpy 0.5 NRC rating.
So rather than being a good absorber, egg cartons are more like placing a low-pass filter across the room.
I know, I'm the buzz-kill who makes a serious reply to an innocent becan joke.