I had been googling around for an accurate quote for something completely unrelated, and ended up on a fascinating site, and ended up poking around in that a bit, and hit a page about one of my favorite molecules ... caffeine!
Well, about half-way down the page there was this tidbit:
... Uh-oh. Well, I guess nobody noticed this or Starbucks would have been the main sponsor of the X-Men movies!Caffeine is a "base analogue" of Adenine, and in fact can sometimes be incorporated into a growing DNA chain, instead of Adenine. Caffeine is a weak mutagen, for this reason.