UBIQUITY, n. The gift or power of being in all places at one time, but not in all places at all times, which is omnipresence, an attribute of God and the luminiferous ether only.
JESTER, n. An officer attached to the king's household to amuse the court by ludicrous actions and utterances . . . the king's own conduct and decrees [being] sufficiently ridiculous for the amusement not only of his court but of all mankind.
Cogito cogito ergo cogito sum -- "I think that I think, therefore I think that I am;" as close an approach to certainty as any philosopher has yet made.