Alternately, we have this market. Apple went ex-dividend today, which would (ordinarily) result in their opening price being adjusted to 2.65 below yesterday's

Alternately, we have this market. Apple went ex-dividend today, which would (ordinarily) result in their opening price being adjusted to 2.65 below yesterday's closing (457.26). In this (real) market, it opened up somewhere between $2 and $5 (459-463). (google's data isn't very fine grained here).