When Obama wins is Jason Kottke's collection of people's postings to Twitter that begin "when Obama wins".
It appears to have started with When Obama wins... unicorns will crap ice cream and pastries.
Of course this is vacuously true! Or at least it would be given the nonexistence of unicorns, which I think we can take as an axiom. To disprove it one would need to produce a counterexample, namely a unicorn that does not crap ice cream and pastries. But we can't do that, since there are no unicorns!
Now, if it said "When Obama wins... everybody will have their own unicorn that craps ice cream and pastries", that would be falsifiable. (And almost certainly false. Let's face it, it's hard to make sure everybody gets a unicorn.)