When journalists start using the same nouns and verbs in their reports, you might want to consider selling your shares quickly. Researchers at University College, Dublin, discovered that in the lead-up to a bubble, journalists displayed a herd-like mentality and all used similar phrases -- "stocks rose again", "scaled new heights" and such like. When the market crashed, their language became more diverse. The verbs rise, fall, close and gain were popular throughout the whole of 2007, but their usage peaked in the week of the crash in October of that year.
Researchers found that the amount of agreement and disagreement in language parallels the major stock market indices. In addition, there was a surge in positive language used just before a bubble burst.