A programme called something like, "What happens in Sunny Beach stays in Sunny Beach" (except obviously it didn't, because it was shown on UK TV).
I'd never seen it before, but just happened to turn over to it as a bloke who was celebrating his 25th birthday put a firework up his backside, then his mate lit it for him. He jumped and rolled around a bit and afterwards, one of his mates remarked that he'd literally ripped himself a new one. But not wanting to miss his "birthday shots", he borrowed sanitary towels from one of his female friends to line his pants, then headed out to a bar. He planned to drink 25 shots, but after only six or seven, he admitted that he needed to go to hospital.
As this young man was explaining what had happened, the look on the Bulgarian doctor's face was priceless. "Well, it was my birthday... so I put a firework up my arse".
The doctor later said that when it was his birthday, he liked some good wine and maybe some cake. "Not putting fireworks up holes".