Riley is a bit of a tearaway at times too
He doesn't play aggresively but he's just into absolutely
everything whether it concerns him or not
Rather than tell him 'No' I now use a different word or rather sound in my case. No can be overused, how many times a day do you find yourself telling him 'No, don't do that' 'No, get of that' 'No biting'? Instead of saying No I make a sound which is like the sound you'd make to try and stop someone doing something - hard to describe but sort of 'uh, uh, uh'. This is really effective and he immediately knows he's done/doing/is about to do something wrong and he even makes the same 'uh uh uh' cackling noise back to me while looking at me sheepishly!
Also Nobo is still a baby really so is testing the boundaries, Riley is 20 months now and his beahviour is better than it used to be. I also used the supernanny method on him when it came to bedtime but I guess it could be used in any situation. He used to pester me and poke me constantly during the night so I would literally sit up, pick him up without engaging with him, say No firmly and place him at the bottom of the bed. I must have done this 80 odd times the first night and only a few less the next night but he got the message in the end and now he doesn't pester me at all, just snuggles down under the cover for a bed time cuddle before going to sleep. I guess this could be adapted to any situation, ie remove him from the situation without creating a fuss and repeat this as many times as it takes for him to get the hint.
Incidentally I do have two cats, Riley's brother Lu is obviously the same age and is an absolute angel and quite honestly never does anything naughty. They were bought up in exactly the same way and receive the same amount of love and attention so it just goes to show that it's not learnt behaviour just that they are naturally naughty