It does sound like it just gets him too over excited - my old cat Ash was like this - not peeing, but he would be really unpredictable and sometimes accidentaly aggressive.
![Shocked :shocked:](https://www.purrsinourhearts.co.uk/Smileys/purrs smilies/catshocked.gif)
He would also scream and yell, get him self all wound up, frustrated and ultimately quite upset. He couldn't even control himself long enough to play and enjoy himself.
![Sad :(](https://www.purrsinourhearts.co.uk/Smileys/purrs smilies/sad.gif)
Our vet said that, in a few cases, some cats are just hyper-sensitive to catnip (like some people can't handle caffiene), and recommended valerian-filled toys. It acts like catnip, but seems to provoke fewer extreme reactions. Zooplus do a really good range of inexpensive valerian toys your boy might enjoy.
![Wink ;)](https://www.purrsinourhearts.co.uk/Smileys/purrs smilies/wink.gif)
(it is also an excuse for more new toys, from his perspective, so everyone wins....
![Evil Laugh :evillaugh:](https://www.purrsinourhearts.co.uk/Smileys/purrs smilies/evillaugh.gif)
)