Whats a good easy science lab?

OK so what you do is you get mountain dew and raisins.....then you put the mountain dew in a graduated cylinder. you don't tell anyone that its mountain dew and raisin's you say the raisins are maggots then you let the "maggots" sit in the mountain dew for a while and then drink some of it. ask the kids why they think the maggots float up and down. then tell them that its mountain dew and raisins.