Overheard in the next room:
(The ice disenser in the fridge door is going.)
6 year old son: "What are you doing?"
11 year old son: "I'm doing an experiment."
Me: (unable to see what's going on) "It better not involve a mess!"
11 year old son: "It doesn't."
(More ice rattling and water running.)
11 year old son: "Success!"
Okay, guess what he was doing.