I have a friend like that who goes around bragging "Oh it used to take me 2 grams at least to get high!" yet after smoking one bowl he would again go around bragging "Oh I'm so stoned that weed is so fucking amazing", to any type of weed, even really weak ones and once to some industrial hemp we found that gave me nothing but an extreme headache.

As a sort of cruel yet hilarious joke, my buddies and I exposed one guy who doesn't know whats what using ground cooking sage leaves and telling him it was Salvia. After, in great detail, explaining what the effects of Salvia were we proceeded to add our bits of sage into a pipe and allowed him to smoke it. After he exhaled he started exclaiming about how he saw all sorts of things but he just "couldn't describe them". He never bragged ever again, and personally I think it was a good way to expose him especially seeing as we had the entire thing on film, as well as when we went to the nearest Sobey's to purchase our tiny bottle of mint.