Embarrassing sounds in the bathroom
Here's a strange one. A stunt in a high class hotel took place to promote a new advice line for parents. Visitors to the ladies toilet overheard sounds of two young people involved in what sounds like sexual intercourse in one of the cubicles. Every so often, the sounds would stop and two young children emerge from the cubicle to the surprise of the women in the bathroom.
The children leave the cubicle door open to reveal a poster promoting the parenting advice line.
It's a fun stunt, although it does beg the question how effective it was. This only looks like a small hotel, so the number of people it reached can barely figure into a few dozen. It also relies on members of the public taking an interest in a potentially embarrassing situation. Perhaps the Flemish are a more open minded people, I'm confident that such a stunt wouldn't generate much of a reaction in the UK.