Mini-Marshmallow Blower     Two 1/2" 90 degree PVC elbows
Two 1/2" tees
Two 1/2" end caps   23" of 1/2" PVC pipe cut into the following lengths:
  Three 2" pipe
  Two 3" pipe
  One 7" pipe
  One 4" pipe   Starting from the top:
  Mouthpiece is the 3" pipe. Insert into elbow. Connect to 2" pipe. Connect to center of tee.
  First handle is 3" pipe. Close with end cap. Connect to elbow. Connect to 2" pipe and connect to tee.
  Connect tee to 2" pipe. COnnect to second tee. Bottom of tee second handle 4" pipe. Close with end cap.
  Barrel is 7" pipe.
  Place marshmallow in mouthpiece and blow a hard, quick breath.   Diagram:
  It doesn't matter too much what shape or configuration you make. We were surprised to see that a marshmallow can be shot through two 90 degree turns and a foot and a half of pipe! No glue makes taking this apart real easy. Takes a Cub about 20 minutes to make. Only tools needed are either a hacksaw or PVC cutter (supervised by an adult).  
Have fun!!!