Beware! 'Tis the Ides of March-
And Don't Ignore Dreamers
Ever wonder what the real story behind the Ides of March? Well, here's some info...

The warning itself was made famous in Shakespeare's play on Julius Caesar, when an unidentified soothsayer tells Caesar, who is on his way to the Senate (and his death), "Beware the ides of March." Caesar replies, "He is a dreamer; let us leave him. Pass.

[After the warning which historians say really happened] according to Plutarch's account, Caesar had previously made the wise decision to stay within the safety of his bedroom chambers on the 15th of March. However, Caesar's "friend" Decimus (Albinus) Brutus (not Marcus Brutus) managed to convince him that the astrologer's warnings were nothing more than superstitious foolishness.

So Julius Caesar decided to attend the Senate on the 15th of March. On his way to the Senate, Caesar "accidentally" met up with the astrologer. Upon seeing Spurinna, Caesar confidently informed the astrologer: "The Ides of March are come."

Spurinna replied, "Yes, they are come, but they are not past."

Later that day - on March 15, 44 B.C.E - Caesar's enemies assassinated him in the Pompey theater, at the foot of Pompey's statue, where the Roman Senate was meeting that day in the temple of Venus.
--About.com

I guess the message is that just because you think someone is a "dreamer," you still better be careful about ignoring them. Just because they're a dreamer doesn't mean that they don't have some important insights.