It's funny, it really is.
We'll have put The Kid in bed when in about ten minutes I'd hear rustling coming from his bedroom. Going in to check I'll find him playing with the toys he's fetched from underneath his bed - tracks and bridges to his wooden train set. Or, if I don't hear the rustling, I may come to check on him later and he'd be fast asleep, cuddling the things.
Or The Girlie: we'll have walked past a puddle, saying, "No, don't jump. No jumping in puddle." And she's fine.
...but about 5 metres later she suddenly spins around!, and races back towards the puddle, adamant to get to it before we do.
Sneaky little things.