Kids at this age are the best - so easily fooled and excited by most anything. This year for April Fool's Day, I found a few great ideas online. First up, the faux "grilled cheese" sandwich made of toasted pound cake (get the bread loaf shape) and orange frosting. I don't recommend the pre-mixed orange frosting. I started with white and added food coloring until it was just the perfect hue of cheddar.
Finally, I put their milk in the freezer before leaving for work that day. Too funny!