Instant weight gain!!

I discovered a way to instantly gain weight!! Take a 1L tub of yogurt (fat content at least 4gm per serve), pour in some whole / extra fat milk, and use a spoon to carefully stir it in, making it more liquid. Then just lift the tub to your mouth, lean back and drink it all down! Instant 1kg gain! Best chased with a banana smoothie made with 2 bans, milk and ice cream, makes about 700 mls, easily adds another half kg too!
Anyone know any other similar foods or methods?