Just press and hold space to drop pencils into the water, simple! Edit: (Don't do this in real life)
I made this a while back, decided to share this just because why not. It's a little water physics engine, I was going to add BIG pencils into the game but nah. Again, DO NOT do this in real life. Also, if you ask me, I will make a Big Pencil to drop into the water and I will add particle effects but if no one asks then I'm not going to do it. That's all, Scratch on!