Some recent threads have got me thinking. DD is almost 5 and vaguely sensible now, but when she was a toddler she walked into my parents' living room and before we noticed she had left the kitchen, she had managed to pull the whole fucking fireplace out of the wall. I decided to bake with her and by the time I had got the flour out of the cupboard she had grabbed the box of eggs and smashed 5 of them on the floor. She managed to climb into the empty bath as I chucked some washing on the airer, empty a full bottle of (expensive Molton Brown, Christmas present) shower gel into the bath and get herself trapped in the resulting slick. Etc, etc. DS needed to be followed at all times until very recently (He's 2.3 and calming down a bit) but has just learned to do forward rolls and does them on his bed without checking he has room to land, and has just this second tipped over a kitchen chair and trapped himself behind it.