It was the experience of Mexico in 1994-5; and it was a substantial part of the explanation of the turmoil in the European Monetary System in 1992-3.
In this respect it is also worth noting the commitment of finance ministers in the euro area, as reflected in a statement issued by the Eurogroup, that, overall, the conversion into euro of all prices, charges and fees administered by their governments will be price neutral or else "smoothed" in favour of the consumer.