Swiss Alps

Swiss mountain guides who always do the same trails can get tired answering the same questions over and over..once an English touristwas giving his guide an especially hard time siily questions...they were wlking through a mountain valley that was strewn with rocks, and the traveller asked, "How did these rocks get here?"
"sir," said the guide, they were brought down by a glacier."
The tourist peered up the mountain and said, "But I don't see any glacier."
"Oh, really?" said the guide. "I guess it has gone back for more rock."