I've put an eye bolt into a ceiling rafter to secure the 15-foot Christmas tree. Then I secure the top of the tree with to the bolt with 200-pound test fishing line.
It was actually my wife who wanted it done with toddler in the house, fearing he might pull it down. Those Xmas tree stands with the water reservoir are a little dodgy for larger trees.
Oh, and then there was the time I installed one of these 21 feet above the living room:
It was a space themed birthday party and after 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, Blast Off! three pre-schooler rode a rocket ship up to the ceiling.