I distinctly remember my Health teacher once claiming that mushrooms are the *exact same* drug as weed, only you can eat it. She said it did all the same stuff, munchies, red-eye, but that it had the added bonus of being untestable.
She claimed that when she was in HS some kids on her sports team started gaining weight and missing practices so the coach made them all take a drug test, which they passed, but then they did a spinal tap and found the active chemical in their spinal fluid (because it stays in your spine forever, according to her).
That health teacher was full of fun little stories like that. Ugh I hope nobody actually took her seriously and tried eating a bunch of mushrooms to beat the sports drug-test
Also I know a nurse who was totally convinced that Ketamine and PCP were exactly the same, just one is more pure. Hell there are a whole bunch of drug urban legends I've heard :s
I second the poster up there who said people who always act way more intoxicated than they should be, are very annoying, and usually bad actors.
And then my friend was telling me when he lived in Michigan his mom was best friends with a huge grower and he'd grow a field of 10' tall plants and each branch was a pound . . . and I have at least 10,000 other stories like that.