In Crete, the answer was “17″ recently. That’s how many drunk British tourists were arrested for insulting the Catholic Church. After a bit of extra imbibing, they donned “nun attire and naughty lingerie,” which didn’t sit too well with the local cops.
The tourists were busted in Malia, which is a popular destination for the young, drunk and rowdy. Even seasoned resort-town resident, who’ve probably become immune to the stupidity that tourists bring, have limits, it seems.
The penalty is most likely to be a fine.
UPDATE: After spending the night in jail wearing the lingerie they were wearing when they were arrested, the men have all been set free. Moreover, since no one showed up to testify that they had been upset by the tourists’ bawdy conduct, the court dropped all charges.