When i was 14 i think, just before i left school i had a sub in one of my chemistry lessons, i think he was in his mid 20's - and instead of doing any work me and him were talking about weed, and how bad most of the hash is in England.

I dont know what it is, but i can spot a weed smoker almost instantly, i just randomly asked him, hey - you smoke weed? and the conversation started from there.