No no! Letterman & Co didn't shake the soda. The soda was sitting on the floor, opened. Then he dropped the Mento in, which was very anti-climatic.
how many did he drop in? the did this on fox & friends about a month ago, seemed to work pretty good...they dropped in like 5-6 at once..
they used a tube filled with mentos placed over the mouth of the bottle and a card/paper to release them into the bottle at the same time...