I'm stuck at the part of the game where you're in the diner, trying to figure out how to get a barrel of "hooch."
The official walkthrough says to tell the guy behind the counter to add ingredients to the soup and then run around to the side where young Emmett Brown is beside the door trying to figure out a way to get a barrel. The walkthrough then says to do this enough times and he's supposed to eventually say "eureka," after which you ask the tender to add ingredients one more time and the story continues from there.
Well I've done this countless times, over and over again, and he never says anything. I can't finish the game because of this problem, does anyone know what possibly could be wrong and how to fix it? Any help would be greatly appreciated.