Smith
While out of the country in 2000, Smith described Mugabe as "mentally deranged." Mugabe responded by threatening to have Smith arrested and prosecuted for genocide should Smith ever return to Zimbabwe. Upon Smith's return, he was met by a mass of reporters waiting to witness him being arrested. Smith was greeted warmly by immigration officials at Harare airport and went home. He was neither arrested nor prosecuted.

http://en.wikipedia.org/wiki/Ian_Smith