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 remember one that came to my elementary school was a yoyo professional or something. Got the entire school hooked on yoyos haha. This would’ve been mid 2000’s.