It's probably happened more than once but I only remember this instance:

My dad and kid brother came home with mcd's at night, and I was like "YES FOOD". I grabbed the big mac and noticed it wasn't as big as it ought to be (THAT'S WHAT SHE SAID) . I check and find out the 2nd beef patty on the bottom was missing. MISSING. I WANT MY MEAT WOMAN!