I got this idea swimming, i noticed the rope dividing the deep and shallow ends was twisted and smooth, I ran my hand on it and thought about a new and cheap way to rifle using a flexible metal, which i have plenty of. u get 2 strands and twist them and mount it in, then stick a spud dead center of it
and maybe, here is another rifleing idea, using razor blades at the end
edit : whoa that is trippy, i made an optical illusion
edit, half done
http://riflewithrazor.mypicgallery.com/
update:

"whoa... I thought pimpmann was black..."-pyromanic13