Liquid Fuel Rocket made from office supplies. Warning, this is kinda dangerous, I had one blow up in my hand already, it was more startling than anything, the two halves flew off in different directions, (wear leather gloves just to be safe.). But they'll fly about 75 feet straight up.
Step 1: You Will Need
Electrical Tape (Substitute Packing Tape)
Ball Point Pen
Robot Sticker (optional)