...make this stuff up.
Indonesian railway stringing concrete balls to deter roof riders
Indonesia's state railway, Kereta Api Indonesia,
has begun stringing concrete balls over rail lines to prevent people
from hitching free rides on top of its trains, according to local news
reports.
The devices are called Goal Bola-bola , or goal balls, as they
resemble soccer goals with the grapefruit-sized concrete balls strung
from chains,