Like Baooozs said, you don't really get "high" off Valium or klonopin (clonazepam), they just put the body and mind at ease and make you feel comfortable. If you take enough to get high you'll just end up feeling tired as hell and probably fall asleep. They do potentiate opiates though, and alcohol, meaning if you take painkillers or have a few drinks on them you may notice them kicking in a lot sooner/harder. These are dangerous combinations if you are not experienced though, and opiates are very addictive. So I'm not recommending or condoning this combo, just educating.