Yeah, I've heard that robo-tripping and weed go really well. I haven't tried it. I have tried mixing robo-tripping and alcohol. Let's just say that it was the worst chemical experience I've ever had. Took me 12 hours to sober up. I couldn't sleep it off, either. I was awake for the whole experience. I had persistent double vision and violent hallucinations, combined with decreased motor skills. I don't think it helped listening to Tool's 10,000 Days album while doing it. Needless to say, I've stayed away from the robo-tripping for a while.