For me it's the repetitive speech about not climbing. All 4 of my kids are climbers. You go to the loo, come out and BAM they're on the kitchen bench/computer desk/wall unit etc. Two days ago DS climbed onto the bench, up onto the fridge, from there to the pantry (6ft tall mind you) and then went to jump to the other cupboard (there's a chest freezer between these but still, a big fall). I nearly had a heart attack and they just don't get it's dangerous