Baked beans are one of the best straight-out-of-the-can items to get messy with. Great for knicker filling, clothes filling, or just pouring them all over yourself, even straight over your head for a baked bean shampoo. They are easy to obtain and fairly cheap to buy. It's even quite possible that you already have a can or two in the pantry. Clean up is very easy, too. Just scoop up the beans left in the bath/shower or drop cloth and place them in a plastic bag and put them out with the rubbish and wash the sauce down the drain. A tip for washing the clothes you have made messy: add a tiny bit of dishwashing detergent into your wash.