he would yell at the kids he spied who had been drawn to the dump with their.22s to plink away at bottles ( or rats , or seagulls ) or by the exotic fascination of `` dump-picking ' : you might find a toy that still worked , a chair that could be mended for a clubhouse , or a junked tv with the picture-tube still intact-if you threw a rock through one of these there was a very satisfying explosion .