It has, therefore, always been a major problem for South African railways to cater adequately for this unpredictable city; three stations have had to be built on the present site during the last fifty years.1958 September 23, C. Alan Cook, “Johannesburg's Fourth Station”, in Railway Magazine, page 639:
Sharks are not unpredictable; for the most part, they do exactly what an apex predator is expected to do.1983, Richard Ellis, The Book of Sharks, Knopf, →ISBN, page 146:
Other unpredictables, like the recent unexpected blizzards and those of 2 years ago, or a hurricane can cost us many thousands of dollars, and have a severe impact on equipment and facilities.1960, United States. Congress. Senate. Committee on Interstate and Foreign Commerce. Subcommittee on Surface Transportation, Motor Vehicle Safety: Hearing..., page 12: