"Between October 1, 1993 and January 24, 1995 prices increased by 5 quadrillion percent. That’s a 5 with 15 zeroes after it."
See more here (thanks to Newmark's Door for the pointer). Maybe Robert Mugabe of Zimbabwe should try harder... at only four digit's, he's no where near making the record books!
Another curious hyperinflation fact:
"At the inflationary peak reached by Chiang Kai-shek's regime, one US dollar was worth Yuan 41 276 595 744 681 - still a world record!"
See this story for more international comparisons.