Whilst travelling on the up escalator (one of those smooth trolley ones) in a supermarket, what would happen if you were to drop a Malteser? Would it roll to the bottom? Would it be carried to to the top? Or would it roll on the spot neither going up or down?
I actually saw this in Asda (obviously I normally shop in Waitrose) and the Malteser just rolled on the spot, I guess it must have been the perfect weight. Anything heavier would roll to the bottom.
