May Allah preserve me from meeting them. It's forbidden to Muslim jinns to show themselves to Humans. The Non-Muslim jinns could be dangerous to human being.
I have heard a lot of stories about shaytans from people, from my Chechen friends I've no preconditions not to believe, so there is no doubt for me that jinns exist.
Once, my Chechen friend, whom I know for a long time as a devoted Muslim, told me, that jinns were following his brother. They were calling him sometimes. So, they were at their small garden, encircled with a concrete walls. There were no one but them in the garden when someone started to call his brother: "Adam!" from the empty place.
He told me, that in Chechnya, there were one brother, who got very interested in jinns...He had taken information from all the sources and had become kinda demonologue.