This is lifted from ladyjestyr but I also consolidate pointers from other places.

http://users.telenet.be/gpunk/mordor-vi.gif
http://lotk.pwp.blueyonder.co.uk/catapult.gif
lotk.pwp.blueyonder.co.uk/catapult2.gif
http://img13.paintedover.com/uploads/13/boromirsinvisiblephonelol8oa.gif

What? No, you'll have to look for yourself, I'm not hotlinking. Go click on them.