From the December 23, 2006 edition of The Economist, Post-modernism is the new black:

In one of his last lectures, in January 1979, four months before Margaret Thatcher came to power in Britain, [Michel Foucault] shocked his students by telling them to read the works of F.A. Hayek if they wanted to know about "the will not to be governed".

See also here. The irony lies not in Foucault's admiration for Hayek, but in the fact it comes as a surprise at all. That the most famous post-modernist is also the least understood.