About a decade ago I flew Ezyjet UK to Croatia, and the flight was completely outnumbered by young, undesirable, chavvy/bogan types complete in uniform by either full Adidas tracksuits or barely clothed at all. By "outnumbered," I mean that on a full flight, there were maybe 20 actual adults with their kids or adult travellers scattered among them.
As soon as we took off, the banter started.. music anthems blasting, loud conversations between groups yelling across rows. It really all kicked off mid-flight however . They got rowdier and started playing music on portable speakers. Some had smuggled full bottles of alcohol onboard and were discreetly swigging until they were drunk enough not to care anymore.
From there, the inebriated choices began.. multiple people (of same or mixed sexes) cramming into the lavatories and at least one tried lighting up a cigarette. We weren’t even halfway through the flight and it had already turned into an airborne nightclub.
The cabin crew couldn’t do much beyond watching it unfold and alerting authorities in Croatia. Luckily, the flight wasn’t diverted. When we landed, some rather stoic-looking Croatian police boarded and singled out the worst offenders (it's almost like they had already done this procedure before and had an expression of "not again"). They were escorted off one by one. Each time, their fellow friends loudly clapped and yahooed. This delayed getting off by about an hour. Still had an awesome holiday in Croatia.
The rest of us—normal passengers—either loathed every minute of it or sat back and treated it like in-flight entertainment. I felt bad for the younger kids onboard, clearly upset by all the chaos. And yes, this was peak European summer.