The claim is of course widely known: LSD "broadens your thinking" and makes you "more creative".
The last incarnation was Steve Jobs' biography taking a swipe at Bill Gates:
“He’d be a broader guy if he had dropped acid once or gone off to an ashram when he was younger”.
The most famous example ever being cited is probably DNA double-helix structure discovery.
However, none of those examples seem to me to be a reliable proof (e.g. correlation at best and random coincidence at worst).
Was there any study ever done that actually proved that LSD had measurably beneficial effect on any mental activity/creativity? (specific definition of creativity left blank since I would rather not exclude some useful study simply because my unimaginative non-LSD-fueled brain didn't think of that precise effect).
P.S. Am I the only one who would LOVE to see this one covered by Mythbusters? :)