mind where you park
The PA28 I fly recently visited a GA airfield and parked in a line which included several microlights. Weather fine with 5 knot wind. Pilot departed to fill up with egg and chips when there is a commotion outside. He goes out to see two microlights on their backs and another embedded in the starboard wingtip of the Cherokee. I think it was a Thruster, anyway it thrusted itself into the glassfibre wingtip. Moral of this story, not only do you have to make sure your own craft is secure but look at others around you. I note when flying in the USA that all aircraft are tied down after flight even between slots. This airfield is near high ground which may have caused some sort of down draught etc.