Way back in 2001, the Australian patent office awarded a man named John Keogh "Innovation Patent #2001100012" for his "circular transportation facilitation device." Or what people who don't work in a government office would call a "wheel."
Mr. Keogh submitted his patent request as a way of illustrating that he thought the office had relaxed its standards a bit too much. He never tried to collect any money from people using wheels. So it turns out that the office recently revoked his patent, just more than a decade after issuing it.
What can you say? Apparently Australian government works much faster than ours does.