Al's heavy book
Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.
Al goes with a different definition of ‘heavy’ and brings in the book Hitler and Stalin: Parallel Lives by Alan Bullock. Pointing out a rectangular black sticker covering part of the box (probably obscuring a brand name or logo), Dave comments that the box even has its own Hitler moustache. The book weighs 0.9 kilograms, earning Al third place.
(Written by JoGo and proofread by Karl Craven)