I've fired an air rifle before, don't know what calibre it was. I used to sit on a chair at my Uncles house which is in Spain in the middle of nowhere and just fire at the telephone lines about 30 yards away. Whenever I hit one it would go 'ting', I got pretty good at it.
I think there's a few pinocchio's on this thread as some of the guns mentioned are almost impossible to get your hands on unless you are very well connected in the underworld, have a Military background or belong to a gun club. The Bazooka post I seriously doubt is true.d