How do you properly dispose of unused Bic lighter?

First, fully use all gas in the lighter, sometimes you can ensure this is done by taping the gas activator button in the open position for a few minutes after it stops lighting (there is always some residual gas in the tank even after it stops lighting.

Then I get some needle nose pliars and pull off the metal cap and ignition assembly including the flint. Then I throughly crush the plastic shell (or tank) with the heel of my boots, cover it with and squish undesirable chicken parts in it, and then lob it over my fence for my neighbor's cat. Poof! Tomorrow, no more lighter! Oh, as far as the metal cap and ignition assembly, I melt them down with a blow torch and recycle them into really cool pieces of art. The torch is about $39.95, but a good one will cost you about $60.00. I just keep adding on to it as I go through lighters. It's about a foot tall so far. And the chicken scraps (gizzards and such), well I don't really have to deal with them anymore with this new system.