get some headies... load up a bong... give him a few good rips...
i smoked up one of my best friends for the first time a long long time ago... packed the bong with some dank, and this kid inhaled so hard im surprised he wasn't sucking up bong water... the chamber just went solid white and then he cashed it and let his finger off the carb to clear it... let out this huge rip, and i shit you not, this kid didn't even cough a little.. a rip like that would have had me on the floor hacking up a lung.... so i packed me a small bowl and hit it and he says "im not really feeling anything"... so i pack him another and he does the same thing as before, another milk hit off this thing, i was high after that first one so i packed him another... and then he cashed that last one, and it all finally caught up to him and hit him like a truck... he had a bit of a psychedelic freak out at that point... screaming "it hurts to think!" and all i could really tell him in my excessively stoned state was "then stop thinking"... he said other things like "dude, im tripping out... im fucking tripping off of weed..." eventually he calmed down after about 30 or 40 minutes and then the munchies hit him....
the funny thing was that i had warned him about this sort of thing and he made jokes about it... i told him he should smoke mids for his first time but he wanted to smoke what i had even though i told him it would be a head fuck... he thanked me after though, despite the being too high to be comfortable he didn't regret it... its kind of ironic that he freaked out far more on weed than LSD, which i was also with him for his first time doing it...