Fun Things to Do in Science Class

Before I start my astronomy unit I usually have students do a fun activity.  Students are given toilet paper, construction paper, NASA stickers, foil, tape, and 10 minutes.  Within that 10 minutes they have to figure out how to construct something that looks like a spacesuit on one of their group members.  It is hilarious to watch. 
I did a similar activity in Houston when I was a part of NEAT (Network of Educator Astronaut Teachers).  All of us applied to become astronauts and were invited down to Houston.  During our spacesuit activity we only had toilet paper but were allowed to use anything on our tables.  Since this activity took place after dinner, you can imagine what ended up in our spacesuit.  Salad bowls, tablecloths, and certain utensils made excellent astronauts.  I can remember how much fun we had as adults doing this and that is what led me to repeating it in my classroom.  Excitement works great for motivation!