One of the most common questions I get in my online Facebook Babyled Weaning group is: "How can I stop my baby from throwing his food?!"
Throwing food is a stage most babies go through, at least once. Early on, they are learning to open and close their fist and might drop food on the floor while they practice this new skill. Later on, they are still developmentally learning what happens to food then they drop it. And if your toddler is throwing food, it's likely to illicit a reaction from you! Toddlers love your attention - whether it's positive or negative.
While it's a stage that will eventually end, throwing food still super-annoying. Nobody likes cleaning spaghetti sauce off the curtains!