Daniel was reading a Captain Underpants book, and in the story a villain goes back in time before anything existed in the universe. It showed the villain on a black book page for the empty universe. Daniel: "Huh, that's not what I thought an empty universe would look like, it should not be a black page, I thought it would look clear, with nothing behind it, just clear as far as the eye could see, before anything existed... you can see black as a color, it exists, it should be completely clear!". 

After dinner on the back porch, the 5 year old comes inside and says "Mommy, I have to tell you something, the plants, the plants told me 'we are so thirsty, please help us drink some water'... can Daniel and I use the super soakers so the plants can have something to drink?" 
Who could say no to such a creative request? They are running around the backyard 'watering the plants', although I hear a lot of brother watering going on as well.