Geocaching-mania

We didn't spend a long time looking for this cache but sat down on the bench to think about where we had not searched on a previous visit. There were many possibilities. Suddenly Bert came on a luminous idea.
I hold the string, attached to the cache which was still in place, as I stood on a small pole when two people sprang off their mopeds, ran into the tree and clogging it. Unnoticed, I could fasten the line around the iron pole, get off the wooden one and sit on the bench. Very weird.
We seemed like air for them.
 
The string was still visible on the road sign.

After almost half an hour I asked their attention and asked what they were doing, how long they use to search for a cache, and whether they lived nearby. This turned out to be a waking up, out of their Geocaching-mania, because we got a reaction. They said they would come back some other day. And they were gone.