We used to take metal pop cans cut the top and bottom out(5 or6 cans if I remember right)the last can you only cut out the top out.Then ya duct tape all the cans together to form a barrel with the last can in line still having the bottom in.then poke a 1/4&quot; hole in that last can on the side down close to the bottom get yourself some lighter fluid and put a good squirt into that hole,slip a tennis ball down the barrel,point the thing where you want to shoot and touch a cig lighter to the hole--and KER-BOOM.If I told you how far that thing would shoot a tennis ball you'd call me a liar-funniest damn thing you ever saw.Please don't tell your mother or wife that you heard it from me! Cam <img src=icon_smile_cool.gif border=0 align=middle>