^: English. My gut reaction is that it's probably the worst language on the planet from the standpoint of exceptions, both in spelling and grammar.
V: The Stargate SG1 universe proposed that Latin was actually a degenerated derivative of the 'Ancients' (Alterans?) language (brief BG, First evolution of humans, from another galaxy (far far away... but not that one you just thought of) who had reached superior technological ability and even eventually understood the universe so well that they ascended to higher plains of existence.); wouldn't it be nice if Latin was re-examined and futurised (that is, keep the basic structure and ideas, but alter the grammar slightly, include the modern form of numbers (either decimal or binary based), and equip it with additional words relating to scientific discoveries and facts, as well as modern day and likely to occur items. One nice thing is that teleportation for example is already derived that way.) then standardised as an international language?