"That had better be Twinkies you're pouring in there."
That's a real still from The Island of Dr. Moreau, possibly the worst movie in Brando's long career, as well as the careers of people who weren't even in it. It was probably this realization that made Brando decide that, if his name was going to be associated with such a turd, he was at least going to have some fun doing it. And so, when filming began, Brando wore something not in the script: a random ice bucket he found. And he refused to take it off.
Brando also wore a radio earpiece that would feed him his lines, in part because the script was constantly being rewritten and in part because he was beyond giving a s**t at this point in his life. The problem was that, according to his co-star David Thewlis, the earpiece would sometimes get interference from police frequencies, so Brando would end up acting out lines like "There's a robbery at Woolworth's!"
That, or Brando was purposely doing that just to f**k with them ... which is highly likely.
And that wasn't even the most bizarre thing to happen on the set. At one point, Brando told the director that he would not perform unless a midget whom he had befriended during production appeared next to him in all his scenes, so then that happened -- you know the miniature version of Dr. Moreau who accompanies him everywhere? That's not in the book or the script. Brando forced them to add all those scenes. And that, friends, is why this happens in the movie: