We are normally fine staying at aires, though have moved from some that seemed a bit dodgy, perhaps if we felt very isolated or there were some people creating a disturbance, or indeed if the TV noise from other vans was far too loud! However we had one night at Appelbo in Sweden where we actually felt in danger, though we probably weren't. There were 2 dedicated small sites to choose from and we chose the one by the river near the town centre. We chatted to locals who came to bath and shampoo in the river and when everyone had gone we settled down for the night. Strangely we felt uneasy and didn't leave the driver's seat swivelled but returned it to the driving position. Just before midnight we heard loud voices and shouting, it didn't sound distressed just 'having fun'. Then about 15 minutes later we heard men's voices, low and whispering outside our little van. Then we heard very strange dragging noises as if something very heavy was being moved across the grass. We quietly got up, not so quietly started the engine and drove straight out of the site with the expanding roof still up. Difficult to know what to do but we eventually drove into what we thought was a youth hotel and parked there for the rest of the night. In the morning we had to return to the aire as we had left our bikes chained to a tree, (luckily not chained to the van) and there was definite evidence of unusual activity, the wooden table was covered in mud and footprints, the grass was churned with long 'slides' in it. What would others have done? Left? Stayed? Joined in? Under what circumstances would you leave an aire?