TIL that in 2020, Burger King ran an advertising campaign featuring a picture of a moldy Whopper, to prove that their burgers are made without preservatives. This unconventional advertising method worked, increasing sales by 14% (according to multiple sources.)
I don’t know if it would work with a Big Mac but I’m curious to know. I imagine the lettuce would have to mold, but McDonald’s shreds their lettuce so maybe it would have time to dry out ¯_(ツ)_/¯
I know it’s been done with a McDonald’s burger and fries before though, and I think it looked the same after a decade or more.